From 3aee2fd43e3059a699af2b63c6f2395e5a55e515 Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Wed, 27 Sep 2017 15:06:31 +0100
Subject: First commit on github -- NetBunch 1.0

---
 src/components/node_components.c | 442 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 442 insertions(+)
 create mode 100644 src/components/node_components.c

(limited to 'src/components/node_components.c')

diff --git a/src/components/node_components.c b/src/components/node_components.c
new file mode 100644
index 0000000..33477f6
--- /dev/null
+++ b/src/components/node_components.c
@@ -0,0 +1,442 @@
+/**
+ *  This program is free software: you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation, either version 3 of the
+ *  License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see
+ *  <http://www.gnu.org/licenses/>.
+ *
+ *  (c) Vincenzo Nicosia 2009-2017 -- <v.nicosia@qmul.ac.uk>
+ * 
+ *  This file is part of NetBunch, a package for complex network
+ *  analysis and modelling. For more information please visit:
+ *
+ *             http://www.complex-networks.net/
+ *
+ *  If you use this software, please add a reference to 
+ *
+ *               V. Latora, V. Nicosia, G. Russo             
+ *   "Complex Networks: Principles, Methods and Applications"
+ *              Cambridge University Press (2017) 
+ *                ISBN: 9781107103184
+ *
+ ***********************************************************************
+ *
+ *  This program computes (the size of) all the components associated
+ *  to a node, namely the OUT-, IN-, SCC (strongly connected
+ *  component), and the WCC (weekly connected component).
+ *
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "utils.h"
+
+#define COMP_IN 0x01
+#define COMP_OUT 0x02
+#define COMP_WCC 0x04
+#define COMP_SCC 0x08
+#define COMP_ALL (COMP_IN | COMP_OUT | COMP_WCC | COMP_SCC)
+
+
+void usage(char *argv[]){
+  printf("********************************************************************\n"
+         "**                                                                **\n"
+         "**                   -*-  node_components  -*-                    **\n"
+         "**                                                                **\n"
+         "**   Find all the components associated to a node of a directed   **\n"
+         "**   graph, namely the IN-, OUT-, SCC, and WCC, and print on      **\n"
+         "**   output their size and/or the list of nodes belonging to      **\n"
+         "**   each component. The first parameter 'graph_in' is the name   **\n"
+         "**   of the file containing the edge list of the graph.           **\n"
+         "**                                                                **\n"
+         "**   The second parameter 'node' is the label of the node whose   **\n"
+         "**   components we are interested in. The (optional) third        **\n"
+         "**   parameter <component> can be one of 'IN', 'OUT', 'INOUT',    **\n"
+         "**   'SCC', 'WCC', respectively corresponding to the IN-, OUT-,   **\n"
+         "**   IN- and OUT-, strongly connected and weakly connected        **\n"
+         "**   component to which 'node'  belongs. If the <component> is    **\n"
+         "**   'ALL', the program computes all the components to which      **\n"
+         "**   'node' belongs. If no third parameter is provided, all       **\n"
+         "**   the components are computed by default.                      **\n"
+         "**                                                                **\n"
+         "**   If SHOW is given as fourth argument, the list nodes in each  **\n"
+         "**   component is dumped on output as well.                       **\n"
+         "**                                                                **\n"
+         "********************************************************************\n"
+         " This is Free Software - You can use and distribute it under \n"
+         " the terms of the GNU General Public License, version 3 or later\n\n"
+         " Please visit http://www.complex-networks.net for more information\n\n"
+         " (c) Vincenzo Nicosia 2010-2017 (v.nicosia@qmul.ac.uk)\n"
+         "********************************************************************\n\n"
+         );
+  printf("Usage: %s <graph_in> <node> [<component> [SHOW]]\n\n" , argv[0]);
+}
+
+int dfs(unsigned int i, unsigned int *J_slap, unsigned int *r_slap, 
+        unsigned int N, unsigned int nc, 
+        unsigned int *ic, unsigned int *f, 
+        char reset){
+  
+  static unsigned int time = 0;
+  unsigned int j, s;
+  
+  if(reset){
+    time = 0;
+  }
+  
+  ic[i] = nc;
+  s = 1;
+  
+  for(j=r_slap[i]; j<r_slap[i+1]; j++){
+    if (ic[J_slap[j]] == 0){
+      s += dfs(J_slap[j], J_slap, r_slap, N, nc, ic, f, 0);
+    }
+  }
+  f[time] = i;
+  time += 1;
+  return s;
+}
+
+
+
+/**
+ * 
+ * Find all the components of the given graph
+ *
+ */
+
+int components(unsigned int *J_slap, unsigned int *r_slap,
+                unsigned int N, unsigned int **ic, 
+                unsigned int **f, unsigned int **sizes){
+
+  unsigned int nc, s;
+  unsigned int i;
+
+  *ic = malloc(N * sizeof(unsigned int));
+  *f = malloc(N * sizeof(unsigned int));
+  *sizes = malloc((N+1) * sizeof(unsigned int));
+  
+  for(i=0; i<N; i++){
+    (*ic)[i] = 0;
+    (*f)[i] = 0;
+  }
+  nc = 0;
+  for(i=0; i<N; i++){
+    while( i < N && (*ic) [i] != 0 )
+      i += 1;
+    if (i == N)
+      break;
+    nc += 1;
+    if (nc ==1){
+      s = dfs(i, J_slap, r_slap, N, nc, *ic, *f, 1);
+    }
+    else{
+      s = dfs(i, J_slap, r_slap, N, nc, *ic, *f, 0);
+    }
+
+    (*sizes)[nc] = s;
+  }
+  return nc;
+}
+
+
+
+int components_rev(unsigned int *J_slap, unsigned int *r_slap,
+                   unsigned int N, unsigned int **ic, 
+                   unsigned int *f, unsigned int **f_T, unsigned int **sizes){
+  
+  unsigned int nc, s;
+  unsigned int  idx;
+  int i;
+  
+  *ic = malloc(N * sizeof(unsigned int));
+  *f_T = malloc(N * sizeof(unsigned int));
+  *sizes = malloc(N * sizeof(unsigned int));
+  
+  for(i=0; i<N; i++){
+    (*ic)[i] = 0;
+  }
+  nc = 0;
+  for(i=N-1; i>=0; i--){
+    idx = f[i];
+    while( (*ic) [idx] != 0 && i > 0 ){
+      i -= 1;
+      idx = f[i];
+    }
+    if (i == 0)
+      break;
+    nc += 1;
+    if (nc == 1){
+      s = dfs(idx, J_slap, r_slap, N, nc, *ic, *f_T, 1);
+    }
+    else{
+      s = dfs(idx, J_slap, r_slap, N, nc, *ic, *f_T, 1);
+    }
+    (*sizes)[nc] = s;
+  }
+  return nc;
+}
+
+
+void compute_comp_out(FILE *filein, unsigned int node, char show){
+  
+  unsigned int N, K, size, i;
+  unsigned int *J_slap, *r_slap, *ic, *f, *I, *J;
+
+  I = J = NULL;
+  K = read_ij(filein, &I, &J);
+  rewind(filein);
+
+  J_slap =  NULL;
+  r_slap =  NULL;
+  /* obtain the SLAP representation of the graph */
+  N = convert_ij2slap(I, J, K, &r_slap, &J_slap);
+  
+  ic = malloc(N * sizeof(unsigned int));
+  f = malloc(N * sizeof(unsigned int));
+  for(i=0; i<N; i++){
+    ic[i] = 0;
+  }
+
+
+  size = dfs(node, J_slap, r_slap, N, 1, ic, f, 1);
+  
+  printf("OUT: %d", size);
+  if (show){
+    for(i=0; i<N; i++){
+      if (ic[i] == 1){
+        printf(" %d", i);
+      }
+    }
+  }
+  printf("\n");
+  free(ic);
+  free(f);
+  free(I);
+  free(J);
+  free(J_slap);
+  free(r_slap);
+}
+
+void compute_comp_in(FILE *filein, unsigned int node, char show){
+
+  unsigned int  N, K, size, i;
+  unsigned int *J_slap, *r_slap, *ic, *f, *I, *J;
+
+  I = J = NULL;
+  
+  K = read_ij(filein, &I, &J);
+  rewind(filein);
+  
+  J_slap =  NULL;
+  r_slap =  NULL;
+  /* obtain the SLAP representation of the graph */
+  N = convert_ij2slap(J, I, K, &r_slap, &J_slap);
+
+  
+  ic = malloc(N * sizeof(unsigned int));
+  f = malloc(N * sizeof(unsigned int));
+  for(i=0; i<N; i++){
+    ic[i] = 0;
+  }
+
+
+  size = dfs(node, J_slap, r_slap, N, 1, ic, f, 1);
+  
+  printf("IN: %d", size);
+  if (show){
+    for(i=0; i<N; i++){
+      if (ic[i] == 1){
+        printf(" %d", i);
+      }
+    }
+  }
+  printf("\n");
+  free(ic);
+  free(f);
+  free(I);
+  free(J);
+  free(J_slap);
+  free(r_slap);
+}
+
+
+
+
+void compute_wcc(FILE *filein, unsigned int node, char show){
+  
+  unsigned int N, K;
+  unsigned int *J_slap, *r_slap;
+  unsigned int *ic, *f, *sizes;
+  unsigned int j, node_comp;
+  
+
+  read_slap(filein, &K, &N, &J_slap, &r_slap);
+
+  rewind(filein);
+  
+  components(J_slap, r_slap, N, &ic, &f, &sizes);
+  
+  node_comp = ic[node];
+  
+  printf("WCC: %d", sizes[node_comp]);
+  if (show){
+    //printf(": ");
+    for(j=0; j<N; j++){
+      if (ic[j] == node_comp){
+        printf(" %d", j);
+      }
+    }
+    printf("\n");
+  }
+  else{
+    printf("\n");
+  }
+  free(sizes);
+  free(J_slap);
+  free(r_slap);
+  free(ic);
+  free(f);
+}
+
+void compute_scc(FILE *filein, unsigned int node, char show){
+
+  unsigned int N, K, N1, N2;
+  unsigned int *I, *J, *J_slap, *r_slap, *J_slap_T, *r_slap_T;
+  unsigned int *ic, *f, *ic_T, *f_T, *sizes_T, *sizes;
+  unsigned int j;
+  unsigned int node_comp;
+
+  
+
+  I = J = NULL;
+  K = read_ij(filein, &I, &J);
+
+  rewind(filein);
+    
+  
+  J_slap = J_slap_T = NULL;
+  r_slap = r_slap_T = NULL;
+  /* obtain the SLAP representation of the graph */
+  N1 = convert_ij2slap(I, J, K, &r_slap, &J_slap);
+  /* obtain the SLAP representation of the transposed graph */
+  N2 = convert_ij2slap(J, I, K, &r_slap_T, &J_slap_T);
+  N = N1 >= N2 ? N1 : N2;
+  
+  components(J_slap, r_slap, N, &ic, &f, &sizes);
+  components_rev(J_slap_T, r_slap_T, N, &ic_T, f, &f_T, &sizes_T);
+  
+  node_comp = ic_T[node];
+  
+  
+  printf("SCC: %d", sizes_T[node_comp]);
+  if (show){
+    for(j=0; j<N; j++){
+      if (ic_T[j] == node_comp){
+        printf(" %d", j);
+      }
+    }
+    printf("\n");
+  }
+  else{
+    printf("\n");
+  }
+  free(sizes);
+  free(sizes_T);
+  free(I);
+  free(J);
+  free(J_slap);
+  free(r_slap);
+  free(J_slap_T);
+  free(r_slap_T);
+  free(ic);
+  free(ic_T);
+  free(f);
+  free(f_T);
+}
+
+
+
+int main(int argc, char *argv[]){
+
+  unsigned int mode=0, node;
+  FILE *filein;
+  char show = 0;
+
+  
+  if (argc < 3){
+    usage(argv);
+    exit(1);
+  }
+
+  filein = openfile_or_exit(argv[1], "r", 2);
+
+  node = atoi(argv[2]);
+  
+  
+  if (argc < 4){
+    mode = COMP_ALL;
+  }
+  else{
+    if (!my_strcasecmp("IN", argv[3])){
+      mode |= COMP_IN;
+    }
+    else  if (!my_strcasecmp("OUT", argv[3])){
+      mode |= COMP_OUT;
+    }
+    else  if (!my_strcasecmp("INOUT", argv[3])){
+      mode |= COMP_OUT | COMP_IN;
+    }
+    else  if (!my_strcasecmp("WCC", argv[3])){
+      mode |= COMP_WCC;
+    }
+    else  if (!my_strcasecmp("SCC", argv[3])){
+      mode |= COMP_SCC;
+    }
+    else  if (!my_strcasecmp("ALL", argv[3])){
+      mode |= COMP_ALL;
+    }
+  }
+
+  if (argc > 4 && !my_strcasecmp("SHOW", argv[4])){
+    show = 1;
+  }
+
+  
+  switch(mode){
+  case COMP_IN:
+    compute_comp_in(filein, node, show);
+    break;
+  case COMP_OUT:
+    compute_comp_out(filein, node, show);
+    break;
+  case COMP_IN | COMP_OUT:
+    compute_comp_in(filein, node, show);
+    compute_comp_out(filein, node, show);
+    break;
+  case COMP_WCC:
+    compute_wcc(filein, node, show);
+    break;
+  case COMP_SCC:
+    compute_scc(filein, node, show);
+    break;
+  default:
+    compute_comp_in(filein, node, show);
+    compute_comp_out(filein, node, show);
+    compute_wcc(filein, node, show);
+    compute_scc(filein, node, show);
+  };
+  fclose(filein);
+  
+}
-- 
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