/* -*- mode: C -*-  */
/* 
   IGraph library.
   Copyright (C) 2009-2012  Gabor Csardi <csardi.gabor@gmail.com>
   334 Harvard st, Cambridge MA, 02139 USA
   
   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 2 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
   02110-1301 USA

*/

#include <igraph.h>
#include <igraph_sparsemat.h>

int main() {
  
  igraph_sparsemat_t A, B, C, D;
  igraph_t G, H;
  igraph_vector_t vect;
  long int i;
  
  /* Create, compress, destroy */
  igraph_sparsemat_init(&A, 100, 20, 50);
  igraph_sparsemat_compress(&A, &B);
  igraph_sparsemat_destroy(&B);
  igraph_sparsemat_destroy(&A);
  
  /* Convert a ring graph to a matrix, print it, compress, print again */
#define VC 10
  igraph_ring(&G, VC, /*directed=*/ 0, /*mutual=*/ 0, /*circular=*/ 1);
  igraph_get_sparsemat(&G, &A);
  igraph_destroy(&G);

  igraph_sparsemat_compress(&A, &B);
  igraph_sparsemat_print(&A, stdout);
  igraph_sparsemat_print(&B, stdout);

  /* Basic query, nrow, ncol, type, is_triplet, is_cc */
  if (igraph_sparsemat_nrow(&A) != VC ||
      igraph_sparsemat_ncol(&A) != VC ||
      igraph_sparsemat_nrow(&B) != VC || 
      igraph_sparsemat_ncol(&B) != VC) {
    return 1;
  }
  if (!igraph_sparsemat_is_triplet(&A)) { return 2; }
  if (!igraph_sparsemat_is_cc(&B))      { return 3; }
  if (igraph_sparsemat_type(&A) != IGRAPH_SPARSEMAT_TRIPLET) { return 4; }
  if (igraph_sparsemat_type(&B) != IGRAPH_SPARSEMAT_CC)      { return 5; }

  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);
#undef VC

  printf("------------------------\n");

  /* Create unit matrices */
  igraph_sparsemat_eye(&A, /*n=*/ 5, /*nzmax=*/ 5, /*value=*/ 1.0, 
		       /*compress=*/ 0);
  igraph_sparsemat_eye(&B, /*n=*/ 5, /*nzmax=*/ 5, /*value=*/ 1.0, 
		       /*compress=*/ 1);
  igraph_sparsemat_print(&A, stdout);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);  

  printf("------------------------\n");

  /* Create diagonal matrices */
  igraph_vector_init(&vect, 5);
  for (i=0; i<5; i++) { VECTOR(vect)[i] = i; }
  igraph_sparsemat_diag(&A, /*nzmax=*/ 5, /*values=*/ &vect, /*compress=*/ 0);
  igraph_sparsemat_diag(&B, /*nzmax=*/ 5, /*values=*/ &vect, /*compress=*/ 1);
  igraph_vector_destroy(&vect);
  igraph_sparsemat_print(&A, stdout);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);

  printf("------------------------\n");
  
  /* Transpose matrices */
  igraph_tree(&G, 10, /*children=*/ 2, IGRAPH_TREE_OUT);
  igraph_get_sparsemat(&G, &A);
  igraph_destroy(&G);
  igraph_sparsemat_compress(&A, &B);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_transpose(&B, &C, /*values=*/ 1);
  igraph_sparsemat_print(&C, stdout);
  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);	
  igraph_sparsemat_destroy(&C);	

  printf("------------------------\n");

  /* Add duplicate elements */
  igraph_sparsemat_init(&A, 10, 10, /*nzmax=*/ 20);
  for (i=1; i<10; i++) {
    igraph_sparsemat_entry(&A, 0, i, 1.0);
  }
  for (i=1; i<10; i++) {
    igraph_sparsemat_entry(&A, 0, i, 1.0);
  }
  igraph_sparsemat_print(&A, stdout);
  igraph_sparsemat_compress(&A, &B);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_dupl(&B);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);	

  printf("------------------------\n");
  
  /* Drop zero elements */
  igraph_sparsemat_init(&A, 10, 10, /*nzmax=*/ 20);
  igraph_sparsemat_entry(&A, 7, 3, 0.0);
  for (i=1; i<10; i++) {
    igraph_sparsemat_entry(&A, 0, i, 1.0);
    igraph_sparsemat_entry(&A, 0, i, 0.0);
  }
  igraph_sparsemat_entry(&A, 0, 0, 0.0);
  igraph_sparsemat_print(&A, stdout);
  igraph_sparsemat_compress(&A, &B);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_dropzeros(&B);
  igraph_sparsemat_print(&B, stdout);
  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);	  

  printf("------------------------\n");

  /* Add two matrices */
  
  igraph_star(&G, 10, IGRAPH_STAR_OUT, /*center=*/ 0);
  igraph_ring(&H, 10, /*directed=*/ 0, /*mutual=*/ 0, /*circular=*/ 1);
  igraph_get_sparsemat(&G, &A);
  igraph_get_sparsemat(&H, &B);
  igraph_destroy(&G);
  igraph_destroy(&H);
  igraph_sparsemat_compress(&A, &C);
  igraph_sparsemat_compress(&B, &D);
  igraph_sparsemat_destroy(&A);
  igraph_sparsemat_destroy(&B);
  igraph_sparsemat_add(&C, &D, /*alpha=*/ 1.0, /*beta=*/ 2.0, &A);
  igraph_sparsemat_destroy(&C);
  igraph_sparsemat_destroy(&D);
  igraph_sparsemat_print(&A, stdout);
  igraph_sparsemat_destroy(&A);

  return 0;
}