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-rw-r--r--doc/latex/latex/structure/activity/degs_to_activity_overlap.tex29
-rw-r--r--doc/latex/latex/structure/activity/degs_to_binary.tex32
-rw-r--r--doc/latex/latex/structure/activity/hamming_dist.tex31
-rw-r--r--doc/latex/latex/structure/activity/layer_activity.tex25
-rw-r--r--doc/latex/latex/structure/activity/layer_activity_vectors.tex27
-rw-r--r--doc/latex/latex/structure/activity/multiplexity.tex30
-rw-r--r--doc/latex/latex/structure/activity/node_activity.tex25
-rw-r--r--doc/latex/latex/structure/activity/node_activity_vectors.tex28
-rw-r--r--doc/latex/latex/structure/activity/node_degree_vectors.tex30
-rw-r--r--doc/latex/latex/structure/correlations/compute_pearson.tex28
-rw-r--r--doc/latex/latex/structure/correlations/compute_rho.tex32
-rw-r--r--doc/latex/latex/structure/correlations/compute_tau.tex31
-rw-r--r--doc/latex/latex/structure/correlations/dump_k_q.tex42
-rw-r--r--doc/latex/latex/structure/correlations/fit_knn.tex50
-rw-r--r--doc/latex/latex/structure/correlations/knn_q_from_degrees.tex64
-rw-r--r--doc/latex/latex/structure/correlations/knn_q_from_layers.tex80
-rw-r--r--doc/latex/latex/structure/correlations/rank_nodes.tex19
-rw-r--r--doc/latex/latex/structure/correlations/rank_nodes_thresh.tex18
-rw-r--r--doc/latex/latex/structure/correlations/rank_occurrence.tex24
-rw-r--r--doc/latex/latex/structure/metrics/aggregate_layers_w.tex30
-rw-r--r--doc/latex/latex/structure/metrics/avg_edge_overlap.tex42
-rw-r--r--doc/latex/latex/structure/metrics/cartography_from_columns.tex35
-rw-r--r--doc/latex/latex/structure/metrics/cartography_from_deg_vectors.tex32
-rw-r--r--doc/latex/latex/structure/metrics/cartography_from_layers.tex45
-rw-r--r--doc/latex/latex/structure/metrics/edge_overlap.tex36
-rw-r--r--doc/latex/latex/structure/metrics/intersect_layers.tex28
-rw-r--r--doc/latex/latex/structure/metrics/overlap_degree.tex45
-rw-r--r--doc/latex/latex/structure/metrics/part_coeff.tex43
-rw-r--r--doc/latex/latex/structure/reinforcement/reinforcement.tex21
29 files changed, 1002 insertions, 0 deletions
diff --git a/doc/latex/latex/structure/activity/degs_to_activity_overlap.tex b/doc/latex/latex/structure/activity/degs_to_activity_overlap.tex
new file mode 100644
index 0000000..6e1908f
--- /dev/null
+++ b/doc/latex/latex/structure/activity/degs_to_activity_overlap.tex
@@ -0,0 +1,29 @@
+\myprogram{{degs\_to\_activity\_overlap.py}}
+ {compute the activity and the total (overlapping) degree of
+ all the nodes of a multiplex.}
+ {$<$degree\_vectors$>$}
+
+\mydescription{Take a file which contains, on the n-th line, the degrees at each
+ layer of the n-th node, (e.g., the result of the
+ script \texttt{node\_degree\_vectors.py}), in the format:
+
+ \hspace{0.5cm}\textit{noden\_deg\_lay1 noden\_deg\_lay2 ... noden\_deg\_layM}
+
+ \noindent and compute the activity (i.e., the number of layers in
+ which a node is not isolated) and the total (overlapping) degree of
+ each node.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, where
+ the n-th line contains the activity and the total degree of the n-th
+ nodem in the format:
+
+ \hspace{0.5cm}\textit{noden\_activity noden\_tot\_deg}
+
+ \noindent As usual, the program assumes that node IDs start from zero
+ and proceed sequentially, without gaps, i.e., if a node ID is not
+ present in any of the layer files given as input, the program
+ considers it as being isolated on all the layers.
+ }
+
+\myreference{\refcorrelations}
+
diff --git a/doc/latex/latex/structure/activity/degs_to_binary.tex b/doc/latex/latex/structure/activity/degs_to_binary.tex
new file mode 100644
index 0000000..7441b2d
--- /dev/null
+++ b/doc/latex/latex/structure/activity/degs_to_binary.tex
@@ -0,0 +1,32 @@
+\myprogram{{degs\_to\_binary.py}}
+ {compute the activity vectors of all the nodes of a multiplex.}
+ {$<$degree\_vectors$>$}
+
+\mydescription{Take a file which contains, on the n-th line, the degrees at each
+ layer of the n-th node, (e.g., the result of the
+ script \texttt{node\_degree\_vectors.py}), in the format:
+
+ \hspace{0.5cm}\textit{noden\_deg\_lay1 noden\_deg\_lay2 ... noden\_deg\_layM}
+
+ \noindent and compute the corresponding node activity bit-strings,
+ where a "1" signals the presence of the node on that layer, while a
+ zero indicates its absence.
+}
+
+\myreturn{The program returns on \texttt{stdout} a list of lines,
+ where the n-th line is the activity bit-string of the n-th
+ node. Additionally, the program prints on \texttt{stderr} the
+ distribution of all activity bit-strings, in the format:
+
+ \hspace{0.5cm}\textit{Bn Bit-string count}
+
+ \noindent Where \textit{B} is the number of ones in the activity
+ bit-string (i.e., the node-activity associated to that activity
+ bit-string), \textit{Bit-string} is the activity bit-string
+ and \textit{count} is the number of times that particular activity
+ bit-string appears in the multiplex.}
+
+
+
+\myreference{\refcorrelations}
+
diff --git a/doc/latex/latex/structure/activity/hamming_dist.tex b/doc/latex/latex/structure/activity/hamming_dist.tex
new file mode 100644
index 0000000..3af188f
--- /dev/null
+++ b/doc/latex/latex/structure/activity/hamming_dist.tex
@@ -0,0 +1,31 @@
+\myprogram{{hamming\_dist.py}}
+ {compute the normalised Hamming distance between all the pairs of
+ layers of a multiplex.}
+ {$<$layer1$>$ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the normalised Hamming distance
+ $H_{\alpha, \beta}$ (i.e., the fraction of nodes which are active on
+ either of the layers, but not on both) between all pairs of
+ layers. The layers are given as input in the
+ files \textit{layer1}, \textit{layer2}, etc.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, in
+ the format:
+
+ \hspace{0.5cm} \textit{layer1 layer2 hamm}
+
+ \noindent where \textit{layer1} and \textit{layer2} are the IDs of
+ the layers, and \textit{hamm} is the value of the normalised Haming
+ distance $H_{layer1, layer2}$. Layers IDs start from zero, are are
+ associated to the layers in the same order in which the layer files
+ are provided on the command line.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/activity/layer_activity.tex b/doc/latex/latex/structure/activity/layer_activity.tex
new file mode 100644
index 0000000..34fcdd2
--- /dev/null
+++ b/doc/latex/latex/structure/activity/layer_activity.tex
@@ -0,0 +1,25 @@
+%%%
+%%% Layer activity
+%%%
+
+\myprogram{{layer\_activity.py}}
+ {compute the activity of the layers of a multiplex, i.e. the
+ number of active nodes on each layer.}
+ {$<$layer1$>$ [$<$layer2$>$ ...]}
+
+\mydescription{Compute and print on output the activity of the layers
+ of a multiplex network, where the layers are given as input in the
+ files \textit{layer1}, \textit{layer2}, etc.
+
+ Each file contains the (undirected) edge list of a layer, and each
+ line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{A listof lines, where the n-th line is the value of activity
+ of the n-th layer, starting from \textbf{0}.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/activity/layer_activity_vectors.tex b/doc/latex/latex/structure/activity/layer_activity_vectors.tex
new file mode 100644
index 0000000..f0c2cd6
--- /dev/null
+++ b/doc/latex/latex/structure/activity/layer_activity_vectors.tex
@@ -0,0 +1,27 @@
+\myprogram{{layer\_activity\_vectors.py}}
+ {compute the activity vectors of all the layers of a multiplex.}
+ {$<$layer1$>$ [$<$layer2$>$ ...]}
+
+\mydescription{Compute and print on output the activity vectors of the
+ layers of a multiplex network, where the layers are given as input
+ in the files \textit{layer1}, \textit{layer2}, etc.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, where
+ the n-th line contains the activity vector of the n-th layer, i.e. a
+ bit-string where each bit is set to ``1'' if the corresponding node
+ is active on the n-th layer, and to ``0'' otherwise.
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, i.e., if a node ID is not present in any
+ of the layer files given as input, the program considers it as being
+ isolated on all the layers.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/activity/multiplexity.tex b/doc/latex/latex/structure/activity/multiplexity.tex
new file mode 100644
index 0000000..b5c5506
--- /dev/null
+++ b/doc/latex/latex/structure/activity/multiplexity.tex
@@ -0,0 +1,30 @@
+\myprogram{{multiplexity.py}}
+ {compute the pairwise multiplexity between all the pairs of
+ layers of a multiplex.}
+ {$<$layer1$>$ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the pairwise multiplexity
+ $Q_{\alpha, \beta}$ (i.e., the fraction of nodes active on both
+ layers) between all pairs of layers. The layers are given as
+ input in the files \textit{layer1}, \textit{layer2}, etc.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, in
+ the format:
+
+ \hspace{0.5cm} \textit{layer1 layer2 mult}
+
+ \noindent where \textit{layer1} and \textit{layer2} are the IDs of
+ the layers, and \textit{mult} is the value of the multiplexity
+ $Q_{layer1, layer2}$. Layers IDs start from zero, are are associated
+ to the layers in the same order in which the layer files are
+ provided on the command line.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/activity/node_activity.tex b/doc/latex/latex/structure/activity/node_activity.tex
new file mode 100644
index 0000000..882233d
--- /dev/null
+++ b/doc/latex/latex/structure/activity/node_activity.tex
@@ -0,0 +1,25 @@
+%%%
+%%% node_activity
+%%%
+\myprogram{{node\_activity.py}}
+ {compute the activity of the nodes of a multiplex, i.e. the
+ number of layers where each node is not isolated.}
+ {$<$layer1$>$ [$<$layer2$>$ ...]}
+
+\mydescription{Compute and print on output the activity of the nodes
+ of a multiplex network, whose layers are given as input in the files
+ \textit{layer1}, \textit{layer2}, etc.
+
+ Each file contains the (undirected) edge list of a layer, and each
+ line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{A list of lines, where the n-th line is the value of activity
+ of the n-th node, starting from \textbf{0}.}
+
+\myreference{\refcorrelations}
+
diff --git a/doc/latex/latex/structure/activity/node_activity_vectors.tex b/doc/latex/latex/structure/activity/node_activity_vectors.tex
new file mode 100644
index 0000000..ca9301d
--- /dev/null
+++ b/doc/latex/latex/structure/activity/node_activity_vectors.tex
@@ -0,0 +1,28 @@
+\myprogram{{node\_activity\_vectors.py}}
+ {compute the activity vectors of all the nodes of a multiplex.}
+ {$<$layer1$>$ [$<$layer2$>$ ...]}
+
+\mydescription{Compute and print on output the activity vectors of the
+ nodes of a multiplex network, whose layers are given as input in the
+ files \textit{layer1}, \textit{layer2}, etc.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, where
+ the n-th line contains the activity vector of the n-th node, i.e. a
+ bit-string where each bit is set to ``1'' if the node is active on
+ the corresponding layer, and to ``0'' otherwise.
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, i.e., if a node ID is not present in any
+ of the layer files given as input, the program considers it as being
+ isolated on all the layers, and will print on output a bit-string of
+ zeros.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/activity/node_degree_vectors.tex b/doc/latex/latex/structure/activity/node_degree_vectors.tex
new file mode 100644
index 0000000..c86f083
--- /dev/null
+++ b/doc/latex/latex/structure/activity/node_degree_vectors.tex
@@ -0,0 +1,30 @@
+\myprogram{{node\_degree\_vectors.py}}
+ {compute the degree vectors of all the nodes of a multiplex network}
+ {$<$layer1$>$ [$<$layer2$>$ ...]}
+
+\mydescription{Compute and print on output the degree vectors of all
+ the nodes of a multiplex network, whose layers are given as
+ input in the files \textit{layer1}, \textit{layer2}, etc.
+
+ Each file contains the (undirected) edge list of a layer, and each
+ line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{A list of lines, where the n-th line is the
+ vector of degrees of the n-th node, in the format:
+
+ \hspace{0.5cm}\textit{noden\_deg\_lay1 noden\_deg\_lay2 ... noden\_deg\_layM}
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, i.e., if a node ID is not present in any
+ of the layer files given as input, the program considers it as being
+ isolated on all the layers.
+
+}
+
+\myreference{\refgrowth\\ \\ \indent \refmetrics}
+
diff --git a/doc/latex/latex/structure/correlations/compute_pearson.tex b/doc/latex/latex/structure/correlations/compute_pearson.tex
new file mode 100644
index 0000000..8202753
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/compute_pearson.tex
@@ -0,0 +1,28 @@
+\myprogram{{compute\_pearson.py}}
+ {compute the Pearson's linear correlation coefficient
+ between two node properties.}
+ {$<$file1$>$ $<$file2$>$}
+
+\mydescription{Compute the Pearson's linear correlation coefficient
+ between two sets of (either integer- or real-valued) node
+ properties provided in the input files \textit{file1}
+ and \textit{file2}. Each input file contains a list of
+ lines, where the n-th line contains the value of a node
+ property for the n-th node. For instance, \textit{file1}
+ and \textit{file2} might contain the degrees of nodes at two
+ distinct layers of a multiplex. However, the program is
+ pretty general and can be used to compute the Pearson's
+ correlation coeffcient between any pairs of node properties.
+ }
+
+\myreturn{The program prints on \texttt{stdout} the value of the
+ Pearson's linear correlation coefficient between the two
+ sets of node properties.
+}
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+}
diff --git a/doc/latex/latex/structure/correlations/compute_rho.tex b/doc/latex/latex/structure/correlations/compute_rho.tex
new file mode 100644
index 0000000..957b04c
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/compute_rho.tex
@@ -0,0 +1,32 @@
+\myprogram{{compute\_rho.py}}
+ {compute the Spearman's rank correlation coefficient $\rho$
+ between two rankings.} {$<$file1$>$ $<$file2$>$}
+
+\mydescription{Compute the Spearman's rank correlation coefficient
+ $\rho$ between two rankings provided in the input
+ files \textit{file1} and \textit{file2}. Each input file
+ contains a list of lines, where the n-th line contains the
+ value of rank of the n-th node. For instance, \textit{file1}
+ and \textit{file2} might contain the ranks of nodes induced
+ by the degree sequences of two distinct layers of a
+ multiplex.
+
+ However, the program is pretty general and can be used to
+ compute the Spearman's rank correlation coefficient between
+ any generic pair of rankings.
+
+ N.B.: A C implementation of this program, with the same
+ interface is also available in the executable
+ file \texttt{compute\_rho}.}
+
+
+\myreturn{The program prints on \texttt{stdout} the value of the
+ Spearman's rank correlation coefficient $\rho$ between the
+ two rankings provided as input. }
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+ }
diff --git a/doc/latex/latex/structure/correlations/compute_tau.tex b/doc/latex/latex/structure/correlations/compute_tau.tex
new file mode 100644
index 0000000..e6e8589
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/compute_tau.tex
@@ -0,0 +1,31 @@
+\myprogram{{compute\_tau.py}}
+ {compute the Kendall's rank correlation coefficient $\tau_b$
+ between two rankings.} {$<$file1$>$ $<$file2$>$}
+
+\mydescription{Compute the Kendall's rank correlation coefficient
+ $\tau_b$ between two rankings provided in the input
+ files \textit{file1} and \textit{file2}. Each input file
+ contains a list of lines, where the n-th line contains the
+ value of rank of the n-th node. For instance, \textit{file1}
+ and \textit{file2} might contain the ranks of nodes induced
+ by the degree sequences of two distinct layers of a
+ multiplex.
+
+ However, the program is pretty general and can be used to
+ compute the Kendall's rank correlation coefficient between
+ any generic pair of rankings.
+
+ N.B.: This implementation takes properly into account rank
+ ties.}
+
+
+\myreturn{The program prints on \texttt{stdout} the value of the
+ Kendall's rank correlation coefficient $\tau_b$ between the
+ two rankings provided as input. }
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+}
diff --git a/doc/latex/latex/structure/correlations/dump_k_q.tex b/doc/latex/latex/structure/correlations/dump_k_q.tex
new file mode 100644
index 0000000..35aef8d
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/dump_k_q.tex
@@ -0,0 +1,42 @@
+M\myprogram{{dump\_k\_q}}
+ {compute the degree sequences of two layers of a multiplex.}
+ {$<$layer1$>$ $<$layer2$>$ $<$pairing$>$}
+
+\mydescription{Compute and dump on \texttt{stdout} the degree
+ sequences of two layers of a multiplex. The input
+ files \textit{layer1} and \textit{layer2} contain the
+ (undirected) edge lists of the two layers, and each line is
+ in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.
+
+ The third file \textit{pairing} is a list of lines in the format:
+
+ \hspace{0.5cm} \textit{IDL1 IDL2}
+
+ where \textit{IDL1} is the ID of a node on layer $1$
+ and \textit{IDL2} is the ID of the same node on layer $2$. For
+ instance, the line:
+
+ \hspace{0.5cm} \textit{5 27}
+
+ indicates that node $5$ on layer $1$ has ID $27$ on layer $2$. }
+
+
+\myreturn{The program prints on \texttt{stdout} the degree of each
+node on the two layers, in the format:
+
+\hspace{0.5cm} \textit{ki qi}
+
+where \textit{ki} is the degree of node \textit{i} on layer $1$
+and \textit{qi} is the degree of node \textit{i} on layer $2$.}
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+ }
diff --git a/doc/latex/latex/structure/correlations/fit_knn.tex b/doc/latex/latex/structure/correlations/fit_knn.tex
new file mode 100644
index 0000000..cb90c2b
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/fit_knn.tex
@@ -0,0 +1,50 @@
+\myprogram{{fit\_knn}}
+ {power-law fit of the inter-layer degree correlation
+ function.}
+ {$<$filein$>$ $<$alpha$>$}
+
+\mydescription{Perform a power-law fit of the inter-layer degree
+ correlation function:
+
+ \begin{equation*}
+ \overline{q}(k) = \frac{1}{N_{q}}\sum_{q'} q' P(q'|k)
+ \end{equation*}
+
+ where $k$ is the degree of a node on layer $1$, $q$ is the
+ degree on layer $2$ and $P(q|k)$ is the probability that a
+ node with degree $k$ on layer $1$ has degree $q$ on layer
+ $2$. The program assumes that $\overline{q}(k)$ can be
+ written in the form $a k^{b}$, and computes the two
+ parameters $a$ and $b$ through a linear fit of the log-log
+ plot of $\overline{q}(k)$.
+
+ The input file \textit{filein} contains a list of lines in
+ the format:
+
+ \hspace{0.5cm} \textit{ki qi}
+
+ where \textit{ki} is the degree of node $i$ at layer $1$
+ and \textit{qi} is the degree of node $i$ at layer $2$.
+
+ The second parameter \textit{alpha} is the ratio of the
+ progression used to generate the exponentially-distributed
+ bins for the log-log plot. Typical values of \textit{alpha}
+ are between $1.1$ and $2.0$.
+
+
+ N.B.: The exponent $b$ computed with this method is known to
+ be inaccurate.
+}
+
+
+
+\myreturn{The program prints on \texttt{stdout} the values of the
+ parameters $a$ and $b$ of the power-law fit $\overline{q}(k)
+ = a k^{b}$.}
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+ }
diff --git a/doc/latex/latex/structure/correlations/knn_q_from_degrees.tex b/doc/latex/latex/structure/correlations/knn_q_from_degrees.tex
new file mode 100644
index 0000000..cab0905
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/knn_q_from_degrees.tex
@@ -0,0 +1,64 @@
+\myprogram{{knn\_q\_from\_degrees.py}}
+ {compute the inter-layer degree-degree correlation function.}
+ {$<$filein$>$}
+
+\mydescription{Compute the inter-layer degree
+ correlation functions for two layers of a multiplex, using
+ the degrees of the nodes specified in the input file. The
+ format of the input file is as follows
+
+\hspace{0.5cm} \textit{ki qi}
+
+where \textit{ki} and \textit{qi} are, respectively, the degree at
+layer 1 and the degree at layer 2 of node \textit{i}.
+
+ If we consider two layers of a multiplex, and we denote by
+ $k$ the degree of a node on the first layer and by $q$ the
+ degree of the same node on the second layers, the
+ inter-layer degree correlation function is defined as
+
+ \begin{equation*}
+ \overline{k}(q) = \frac{1}{N_{k}}\sum_{k'} k' P(k'|q)
+ \end{equation*}
+
+ where $P(k'|q)$ is the probability that a node with degree
+ $q$ on the second layer has degree equal to $k'$ on the
+ first layer, and $N_k$ is the number of nodes with degree
+ $k$ on the first layer. The quantity $\overline{k}(q)$ is
+ the expected degree at layer $1$ of node that have degree
+ equal to $q$ on layer $2$. The dual quantity:
+
+ \begin{equation*}
+ \overline{q}(k) = \frac{1}{N_{q}}\sum_{q'} q' P(q'|k)
+ \end{equation*}
+
+ is the average degree on layer $2$ of nodes having degree
+ $k$ on layer $1$.
+}
+
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in
+ the format:
+
+ \hspace{0.5cm} \textit{k $\overline{q}(k)$}
+
+ where \textit{k} is the degree on layer $1$ and
+ $\overline{q}(k)$ is the average degree on layer $2$ of
+ nodes having degree equal to $k$ on layer $1$.
+
+ The program also prints on \texttt{stderr} a list of lines in
+ the format:
+
+ \hspace{0.5cm} \textit{q $\overline{k}(q)$}
+
+ where \textit{q} is the degree on layer $2$ and
+ $\overline{k}(q)$ is the average degree on layer $1$ of
+ nodes having degree equal to $q$ on layer $2$.
+ }
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+ }
diff --git a/doc/latex/latex/structure/correlations/knn_q_from_layers.tex b/doc/latex/latex/structure/correlations/knn_q_from_layers.tex
new file mode 100644
index 0000000..f124e55
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/knn_q_from_layers.tex
@@ -0,0 +1,80 @@
+\myprogram{{knn\_q\_from\_layers.py}}
+ {compute intra-layer and inter-layer degree-degree
+ correlation coefficients.} {$<$layer1$>$ $<$layer2$>$}
+
+\mydescription{Compute the intra-layer and the inter-layer degree
+ correlation functions for two layers given as input. The
+ intra-layer degree correlation function quantifies the
+ presence of degree-degree correlations in a single layer
+ network, and is defined as:
+
+ \begin{equation*}
+ \avg{k_{nn}(k)} = \frac{1}{k N_k}\sum_{k'}k'P(k'|k)
+ \end{equation*}
+
+ where $P(k'|k)$ is the probability that a neighbour of a
+ node with degree $k$ has degree $k'$, and $N_k$ is the
+ number of nodes with degree $k$. The quantity
+ $\avg{k_{nn}(k)}$ is the average degree of the neighbours of
+ nodes having degree equal to $k$.
+
+ If we consider two layers of a multiplex, and we denote by
+ $k$ the degree of a node on the first layer and by $q$ the
+ degree of the same node on the second layers, the
+ inter-layer degree correlation function is defined as
+
+ \begin{equation*}
+ \overline{k}(q) = \sum_{k'} k' P(k'|q)
+ \end{equation*}
+
+ where $P(k'|q)$ is the probability that a node with degree
+ $q$ on the second layer has degree equal to $k'$ on the
+ first layer, and $N_q$ is the number of nodes with degree
+ $q$ on the second layer. The quantity $\overline{k}(q)$ is
+ the expected degree at layer $1$ of node that have degree
+ equal to $q$ on layer $2$. The dual quantity:
+
+ \begin{equation*}
+ \overline{q}(k) = \sum_{q'} q' P(q'|k)
+ \end{equation*}
+
+ is the average degree on layer $2$ of nodes having degree
+ $k$ on layer $1$.
+}
+
+
+\myreturn{The program creates two output files, respectively called
+
+\hspace{0.5cm} \textit{file1\_file2\_k1}
+
+and
+
+\hspace{0.5cm} \textit{file1\_file2\_k2}
+
+The first file contains a list of lines in the format:
+
+\hspace{0.5cm} \textit{k $\avg{k_{nn}(k)}$ $\sigma_k$
+$\overline{q}(k)$ $\sigma_{\overline{q}}$}
+
+where $k$ is the degree at first layer, $\avg{k_{nn}(k)}$ is the
+average degree of the neighbours at layer $1$ of nodes having degree
+$k$ at layer $1$, $\sigma_k$ is the standard deviation associated to
+$\avg{k_{nn}(k)}$, $\overline{q}(k)$ is the average degree at layer
+$2$ of nodes having degree equal to $k$ at layer $1$, and
+$\sigma_{\overline{q}}$ is the standard deviation associated to
+$\overline{q}(k)$.
+
+The second file contains a similar list of lines, in the format:
+
+\hspace{0.5cm} \textit{q $\avg{q_{nn}(q)}$ $\sigma_q$
+$\overline{k}(q)$ $\sigma_{\overline{k}}$}
+
+with obvious meaning.
+}
+
+\myreference{\refcorrelations
+
+ \refgrowth
+
+ \refnonlinear
+ }
diff --git a/doc/latex/latex/structure/correlations/rank_nodes.tex b/doc/latex/latex/structure/correlations/rank_nodes.tex
new file mode 100644
index 0000000..b1a970a
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/rank_nodes.tex
@@ -0,0 +1,19 @@
+\myprogram{{rank\_nodes.py}}
+ {rank the nodes of a layer according to a given structural
+ descriptor.} {$<$prop\_file$>$}
+
+\mydescription{Get a file as input, whose n-th line corresponds to the value of a
+ certain property of the n-th node, and rank the nodes according to
+ that property, taking into account ranking ties properly.
+
+ For example, if \textit{propfile} contains the degrees of the nodes
+ at a certain layer of the multiplex, the computes the ranking induced
+ by degrees, where the node with the highest degree will be assigned a
+ rank equal to \textbf{1} (one).
+}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, where
+ the n-th line contains the rank of the n-th node corresponding to the
+ values of the structural descriptor provided in the input file.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/correlations/rank_nodes_thresh.tex b/doc/latex/latex/structure/correlations/rank_nodes_thresh.tex
new file mode 100644
index 0000000..3b430d1
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/rank_nodes_thresh.tex
@@ -0,0 +1,18 @@
+\myprogram{{rank\_nodes\_thresh.py}}
+ {rank the nodes of a layer whose value of a given structural
+ descriptor is above a threshold.} {$<$prop\_file$>$ $<$thresh$>$}
+
+\mydescription{Get a file as input, whose n-th line corresponds to the value of a
+ certain property of the n-th node, and rank the nodes according to
+ that property, taking into account ranking ties properly. The rank of
+ all the nodes whose value of the structural descriptor is smaller
+ than the threshold \textit{thresh} specified as second parameter is
+ set to \textbf{0} (ZERO). }
+
+\myreturn{The program prints on \texttt{stdout} a list of lines, where
+ the n-th line contains the rank of the n-th node corresponding to the
+ values of the structural descriptor provided in the input file, or
+ zero if such desxriptor is below the specified
+ threshold \textit{thresh}.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/correlations/rank_occurrence.tex b/doc/latex/latex/structure/correlations/rank_occurrence.tex
new file mode 100644
index 0000000..96fb914
--- /dev/null
+++ b/doc/latex/latex/structure/correlations/rank_occurrence.tex
@@ -0,0 +1,24 @@
+\myprogram{{rank\_occurrence.py}}
+ {compute the intersection of two rankings.}
+ {$<$rank1$>$ $<$rank2$>$ $<$increment$>$}
+
+\mydescription{Get two rankings \textit{rank1} and \textit{rank2}
+ and compute the size of
+the \textit{k}-intersection, i.e. the number of elements which are
+present in the first k positions of both rankings, as a function
+of \textit{k}. The parameter \textit{increment} determines the
+distance between two subsequent values of \textit{k}.
+
+Each input file is a list of node IDs, one per line, where the first
+line contains the ID of the highest ranked node.
+}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+format:
+
+ \hspace{0.5cm} \textit{k num\_k}
+
+ where \textit{num\_k} is the number of nodes which are present in
+ the first \textit{k} positions of both rankings.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/metrics/aggregate_layers_w.tex b/doc/latex/latex/structure/metrics/aggregate_layers_w.tex
new file mode 100644
index 0000000..8917e3e
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/aggregate_layers_w.tex
@@ -0,0 +1,30 @@
+\myprogram{{aggregate\_layers\_w.py}}
+ {compute the (weighted) aggregated graph associated to a
+ multiplex.} {$<$layer1$>$ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the edge list of the
+ weighted aggregated graph associated to the multiplex
+ network given on input. An edge is present in the
+ aggregated graph if it exists in at least one of the M
+ layers of the multiplex.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} the edge list of the
+ aggregated graph associated to the multiplex network. The edge list
+ is a list of lines in the format:
+
+
+ \hspace{0.5cm} \textit{ID1 ID2 weight}
+
+ \noindent where \textit{ID1} and \textit{ID2} are the IDs of the two
+ nodes and \textit{weight} is the number of layers in which an edge
+ between \textit{ID1} and \textit{ID2} exists.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/metrics/avg_edge_overlap.tex b/doc/latex/latex/structure/metrics/avg_edge_overlap.tex
new file mode 100644
index 0000000..4df2d51
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/avg_edge_overlap.tex
@@ -0,0 +1,42 @@
+\myprogram{{avg\_edge\_overlap.py}}
+ {compute the average edge overlap of a multiplex.}
+ {$<$layer1$>$ [$<$layer2$>$...]}
+
+\mydescription{Compute and print on output the average edge overlap
+
+ \begin{equation*} \omega^{*}
+ = \frac{\sum_{i}\sum_{j>i}\sum_{\alpha}a_{ij}\lay{\alpha}}{ \sum_{i}\sum_{j>i}(1
+ - \delta_{0,\sum_{\alpha}a_{ij}\lay{\alpha}})} \end{equation*}
+
+ \noindent i.e., the expected \textit{number} of layers on which an
+ edge of the multiplex exists, and the corresponding normalised
+ quantity:
+
+ \begin{equation*}
+ \omega = \frac{\sum_{i}\sum_{j>i}\sum_{\alpha}a_{ij}\lay{\alpha}}{M \sum_{i}\sum_{j>i}(1
+ - \delta_{0,\sum_{\alpha}a_{ij}\lay{\alpha}})}
+ \end{equation*}
+
+ \noindent that is the expected \textit{fraction} of layers on which
+ an edge of the multiplex is present.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a single line, in the
+ format:
+
+ \hspace{0.5cm} \textit{omega\_star omega}
+
+ \noindent where \textit{omega\_star} and \textit{omega} are,
+ respectively, the expected number and fraction of layers in which an
+ edge is present.}
+
+\myreference{\refmetrics
+
+ \vspace{0.5cm}\refvisibility}
diff --git a/doc/latex/latex/structure/metrics/cartography_from_columns.tex b/doc/latex/latex/structure/metrics/cartography_from_columns.tex
new file mode 100644
index 0000000..8e797af
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/cartography_from_columns.tex
@@ -0,0 +1,35 @@
+\myprogram{{cartography\_from\_columns.py}}
+ {compute total and participation coefficient of generic
+ structural descriptors of the nodes of a multiplex.}
+ {$<$filein$>$ $<$col1$>$ $<$col2$>$ [$<$col3$>$...]}
+
+\mydescription{Compute and print on output the sum and the
+ corresponding participation coefficient of a generic
+ structural descriptor of the nodes of a multiplex.
+
+ \noindent The input file is a generic collection of
+ single-space-separated columns, where each line corresponds to a
+ node. The user must specify the IDs of the columns which contain
+ the node structural descriptors to be used in the cartography
+ diagram. Columns IDs start from ZERO. For example:
+
+ \textbf{python cartography\_from\_layers.py filein.txt 0
+ 2 4 6 8}
+
+ \noindent will create a cartography diagram assuming that the
+ multiplex network has five layers, and that the node structural
+ descriptors at each layers are contained in the first (0), third
+ (2), fifth (4), seventh (6) and nineth (8) columns of each row.}
+
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+ format:
+
+ \hspace{0.5cm} \textit{tot\_n P\_n}
+
+ where \textit{tot\_n} is the sum over the layers of the considered
+ structural descriptor for node $n$, and \textit{P\_n} is the
+ associated participation coefficient
+ }
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/metrics/cartography_from_deg_vectors.tex b/doc/latex/latex/structure/metrics/cartography_from_deg_vectors.tex
new file mode 100644
index 0000000..848ffd1
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/cartography_from_deg_vectors.tex
@@ -0,0 +1,32 @@
+\myprogram{{cartography\_from\_deg\_vectors.py}}
+ {create a multiplex cartography diagram.}
+ {$<$node\_deg\_vectors$>$}
+
+\mydescription{Compute and print on output the total degree and the
+ multiplex participation coefficient of all the nodes of a
+ multiplex network whose list of node degree vectors is
+ provided as input. The input file is in the format:
+
+ \hspace{0.5cm} \textit{IDn\_deg1 IDn\_deg\_2 ... IDn\_degM}
+
+ \noindent where \textit{IDn\_degX} is the degree of node $n$ at
+ layer $X$. The input file can be generated using the
+ script \texttt{node\_degree\_vectors.py}.}
+
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+ format:
+
+ \hspace{0.5cm} \textit{tot\_deg part\_coeff}
+
+ \noindent where \textit{tot\_deg} is the total degree of the node
+ and \textit{part\_coeff} is the corresponding participation
+ coefficient.
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, so if one of the lines in the input
+ files contains just zeros, the program considers the corresponding
+ node as being isolated on all the layers, and both its total degree
+ and multiplex participation coefficient are set equal to zero. }
+
+\myreference{\refmetrics}
diff --git a/doc/latex/latex/structure/metrics/cartography_from_layers.tex b/doc/latex/latex/structure/metrics/cartography_from_layers.tex
new file mode 100644
index 0000000..8958cef
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/cartography_from_layers.tex
@@ -0,0 +1,45 @@
+\myprogram{{cartography\_from\_layers.py}}
+ {compute the total degree and the multiplex participation
+ coefficient of all the nodes of a multiplex.} {$<$layer1$>$
+ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the total degree and the multiplex participation
+ coefficient $P_i$ for each node $i$ of a multiplex. The
+ participation coefficient is defined as:
+
+ \begin{equation*}
+ P_i=\frac{M}{M-1}\left[1-\sum_{\alpha=1}^M\biggl(\frac{k_i^{[\alpha]}}{o_i}\biggr)^2\right]
+ \end{equation*}
+
+ \noindent Note that $P_i$ takes values in $[0,1]$, where $P_i=0$
+ if and only if node $i$ is active on exactly one of the layers,
+ while $P_i=1$ if node $i$ has equal degree on all the $M$ layers.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+ format:
+
+ \hspace{0.5cm} \textit{deg\_n P\_n col\_n}
+
+ where \textit{deg\_n} is the total degree of node $n$, \textit{P\_n}
+ is the participation coefficient of node $n$ and \textit{col} is the
+ integer representation of the activity bitstring of node $n$, which
+ is a number between $0$ and $2^{M}-1$. The field \textit{col} might
+ be useful for the visualisation of the multiplex cartography
+ diagram, where it would be possible to associate different colors to
+ nodes having different node activity patterns.
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, i.e., if a node ID is not present in any
+ of the layer files given as input, the program considers it as being
+ isolated on all the layers, and is set to zero.
+ }
+
+\myreference{\refmetrics}
diff --git a/doc/latex/latex/structure/metrics/edge_overlap.tex b/doc/latex/latex/structure/metrics/edge_overlap.tex
new file mode 100644
index 0000000..64d7dbf
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/edge_overlap.tex
@@ -0,0 +1,36 @@
+\myprogram{{edge\_overlap.py}}
+ {compute the edge overlap of all the edges of the
+ multiplex.}
+ {$<$layer1$>$ [$<$layer2$>$...]}
+
+\mydescription{Compute and print on output the edge overlap $o_{ij}$ of each
+ edge of the multiplex. Given a pair of nodes $(i,j)$ that
+ are directly connected on at least one of the $M$ layers,
+ the edge overlap $o_{ij}$ is defined as:
+
+ \begin{equation*}
+ o_{ij} = \sum_{\alpha}a_{ij}\lay{\alpha}
+ \end{equation*}
+
+ \noindent i.e., the number of layers on which the edge $(i,j)$
+ exists.
+
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+ format:
+
+ \hspace{0.5cm} \textit{ID\_1 ID\_2 overlap}
+
+ \noindent where \textit{ID\_1} and \textit{ID\_2} are the IDs of the
+ end-points of the edge, and \textit{overlap} is the number of layers
+ in which the edge exists.}
+
+\myreference{\refmetrics}
diff --git a/doc/latex/latex/structure/metrics/intersect_layers.tex b/doc/latex/latex/structure/metrics/intersect_layers.tex
new file mode 100644
index 0000000..0824400
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/intersect_layers.tex
@@ -0,0 +1,28 @@
+\myprogram{{intersect\_layers.py}}
+ {compute the intersection graph associated to a
+ multiplex.} {$<$layer1$>$ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the edge list of the
+ intersection graph associated to the multiplex network
+ given on input, where an edge exists only if it is
+ present on \textbf{all} the layers of the multiplex.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} the edge list of the
+ intersection graph associated to the multiplex network. The edge
+ list is a list of lines in the format:
+
+
+ \hspace{0.5cm} \textit{ID1 ID2}
+
+ \noindent where \textit{ID1} and \textit{ID2} are the IDs of the two
+ nodes.}
+
+\myreference{\refcorrelations}
diff --git a/doc/latex/latex/structure/metrics/overlap_degree.tex b/doc/latex/latex/structure/metrics/overlap_degree.tex
new file mode 100644
index 0000000..500a76a
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/overlap_degree.tex
@@ -0,0 +1,45 @@
+\myprogram{{overlap\_degree.py}}
+ {compute the total (overlapping) degree of all the nodes of
+ a multiplex and the corresponding Z-score. } {$<$layer1$>$ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the total degree $o_i$ of each
+ node $i$ of a multiplex, defined as:
+
+ \begin{equation*}
+ o_{i} = \sum_{\alpha}\sum_{j}a_{ij}\lay{\alpha}
+ \end{equation*}
+
+ \noindent and the corresponding Z-score:
+
+ \begin{equation*}
+ z(o_i) = \frac{o_i - \avg{o}}{\sigma_o}
+ \end{equation*}
+
+ \noindent where $\avg{o}$ and $\sigma_o$ are, respectively, the mean
+ and the standard deviation of the total degree computed over all the
+ active nodes of the multiplex.
+
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+ format:
+
+ \hspace{0.5cm} \textit{ID\_n deg\_n z\_n}
+
+ where \textit{ID\_n} is the ID of the node, \textit{deg\_n} is its
+ total degree, and \textit{z\_n} is the corresponding Z-score.
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, i.e., if a node ID is not present in any
+ of the layer files given as input, the program considers it as being
+ isolated on all the layers, and the node is omitted from the
+ output.}
+
+\myreference{\refmetrics}
diff --git a/doc/latex/latex/structure/metrics/part_coeff.tex b/doc/latex/latex/structure/metrics/part_coeff.tex
new file mode 100644
index 0000000..f3afd7d
--- /dev/null
+++ b/doc/latex/latex/structure/metrics/part_coeff.tex
@@ -0,0 +1,43 @@
+\myprogram{{part\_coeff.py}}
+ {compute the multiplex partifipation coefficient of all the nodes of
+ a multiplex.} {$<$layer1$>$ $<$layer2$>$ [$<$layer3$>$...]}
+
+\mydescription{Compute and print on output the multiplex participation
+ coefficient $P_i$ for each node $i$ of a multiplex. The
+ participation coefficient is defined as:
+
+ \begin{equation*}
+ P_i=\frac{M}{M-1}\left[1-\sum_{\alpha=1}^M\biggl(\frac{k_i^{[\alpha]}}{o_i}\biggr)^2\right]
+ \end{equation*}
+
+ \noindent Note that $P_i$ takes values in $[0,1]$, where $P_i=0$
+ if and only if node $i$ is active on exactly one of the layers,
+ while $P_i=1$ if node $i$ has equal degree on all the $M$ layers.
+
+ Each input file contains the (undirected) edge list of a layer, and
+ each line is in the format:
+
+ \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
+
+ where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
+ endpoints of an edge.}
+
+\myreturn{The program prints on \texttt{stdout} a list of lines in the
+ format:
+
+ \hspace{0.5cm} \textit{deg\_n P\_n col\_n}
+
+ where \textit{deg\_n} is the total degree of node $n$, \textit{P\_n}
+ is the participation coefficient of node $n$ and \textit{col} is the
+ integer representation of the activity bitstring of node $n$, which
+ is a number between $0$ and $2^{M}-1$. The field \textit{col} might
+ be useful in visualisations, where it would be possible to associate
+ different colors to nodes having diffrent node activity patterns.
+
+ \noindent As usual, node IDs start from zero and proceed
+ sequentially, without gaps, i.e., if a node ID is not present in any
+ of the layer files given as input, the program considers it as being
+ isolated on all the layers, and is set to zero.
+ }
+
+\myreference{\refmetrics}
diff --git a/doc/latex/latex/structure/reinforcement/reinforcement.tex b/doc/latex/latex/structure/reinforcement/reinforcement.tex
new file mode 100644
index 0000000..a65b05e
--- /dev/null
+++ b/doc/latex/latex/structure/reinforcement/reinforcement.tex
@@ -0,0 +1,21 @@
+%%%
+%%% Layer activity
+%%%
+
+\myprogram{{reinforcement.py}}
+ {compute the probability to have a link between two nodes in layer $1$ given their weight in layer $2$.}
+ {$<$layer1$>$ $<$layer2$>$ $<N_{bins}>$ $<min_{value}>$ $<max_{value}>$}
+
+\mydescription{Compute and print on output the probability to have a link between two nodes in layer $1$ given their weight in layer $2$.
+As input are given the files \textit{layer1}, \textit{layer2}, the number of bins for the link weights of the second layer, the minimum and the maximum values of the binning.
+
+ The first file contains the binary edge list of layer $1$, the second file contains the weighted edge list of layer $2$. each
+ line is in the format:
+
+ \hspace{0.5cm}\textit{bin\_min} \textit{bin\_max} \textit{freq}
+
+ where \textit{bin\_min} and \textit{bin\_max} are the minimum and maximum values of the link weights of layer $2$ in that binning, and \textit{freq} is the probability to have a link on layer $1$ given such weight in layer $2$.}
+
+\myreturn{A list of lines, where the n-th line is the minimum and maximum values of the weight of the links in layer $2$ in the n-th bin, and the frequency to have a link on layer $2$ given that weight.}
+
+\myreference{\refmetrics}