sba: cholmod_timing.cpp Source File

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00034 
00035 #include "cholmod.h"
00036 #include "sba/sba.h"
00037 #include <time.h>
00038 #define CPUTIME ((double) (clock ( )) / CLOCKS_PER_SEC)
00039 
00040 int main (void)
00041 {
00042     cholmod_sparse *A ;
00043     cholmod_dense *x, *b, *r ;
00044     cholmod_factor *L ;
00045     double one [2] = {1,0}, m1 [2] = {-1,0} ;       /* basic scalars */
00046     cholmod_common c ;
00047     cholmod_start (&c) ;                            /* start CHOLMOD */
00048     A = cholmod_read_sparse (stdin, &c) ;           /* read in a matrix */
00049     cholmod_print_sparse (A, "A", &c) ;             /* print the matrix */
00050     if (A == NULL || A->stype == 0)                 /* A must be symmetric */
00051     {
00052         cholmod_free_sparse (&A, &c) ;
00053         cholmod_finish (&c) ;
00054         return (0) ;
00055     }
00056     b = cholmod_ones (A->nrow, 1, A->xtype, &c) ;   /* b = ones(n,1) */
00057     double t0 = CPUTIME;
00058     L = cholmod_analyze (A, &c) ;                   /* analyze */
00059     cholmod_factorize (A, L, &c) ;                  /* factorize */
00060     x = cholmod_solve (CHOLMOD_A, L, b, &c) ;       /* solve Ax=b */
00061     double t1 = CPUTIME;
00062     printf("Time: %12.4f \n", t1-t0);
00063     r = cholmod_copy_dense (b, &c) ;                /* r = b */
00064     cholmod_sdmult (A, 0, m1, one, x, r, &c) ;      /* r = r-Ax */
00065     printf ("norm(b-Ax) %8.1e\n",
00066             cholmod_norm_dense (r, 0, &c)) ;        /* print norm(r) */
00067     cholmod_free_factor (&L, &c) ;                  /* free matrices */
00068     cholmod_free_sparse (&A, &c) ;
00069     cholmod_free_dense (&r, &c) ;
00070     cholmod_free_dense (&x, &c) ;
00071     cholmod_free_dense (&b, &c) ;
00072     cholmod_finish (&c) ;                           /* finish CHOLMOD */
00073     return (0) ;
00074 }