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// CXSparse/Demo/cs_demo1: demo program for CXSparse
// CXSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
// SPDX-License-Identifier: LGPL-2.1+
#include "cs.h"
int main (void)
{
cs_ci *T, *A, *Eye, *AT, *C, *D ;
int i, m ;
int version [3] ;
cxsparse_version (version) ;
printf ("CXSparse v%d.%d.%d\n", version [0], version [1], version [2]) ;
#ifndef TEST_COVERAGE
if ((version [0] != CS_VER) || (version [1] != CS_SUBVER) ||
(version [2] != CS_SUBSUB))
{
fprintf (stderr, "version in header does not match library\n") ;
abort ( ) ;
}
#endif
T = cs_ci_load (stdin) ; /* load triplet matrix T from stdin */
printf ("T:\n") ; cs_ci_print (T, 0) ; /* print T */
A = cs_ci_compress (T) ; /* A = compressed-column form of T */
printf ("A:\n") ; cs_ci_print (A, 0) ; /* print A */
cs_ci_spfree (T) ; /* clear T */
AT = cs_ci_transpose (A, 1) ; /* AT = A' */
printf ("AT:\n") ; cs_ci_print (AT, 0) ; /* print AT */
m = A ? A->m : 0 ; /* m = # of rows of A */
T = cs_ci_spalloc (m, m, m, 1, 1) ; /* create triplet identity matrix */
for (i = 0 ; i < m ; i++) cs_ci_entry (T, i, i, 1) ;
Eye = cs_ci_compress (T) ; /* Eye = speye (m) */
cs_ci_spfree (T) ;
C = cs_ci_multiply (A, AT) ; /* C = A*A' */
D = cs_ci_add (C, Eye, 1, cs_ci_norm (C)) ; /* D = C + Eye*norm (C,1) */
printf ("D:\n") ; cs_ci_print (D, 0) ; /* print D */
cs_ci_spfree (A) ; /* clear A AT C D Eye */
cs_ci_spfree (AT) ;
cs_ci_spfree (C) ;
cs_ci_spfree (D) ;
cs_ci_spfree (Eye) ;
return (0) ;
}
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