cs_usolve.c
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00001 #include "cs.h"
00002 /* solve Ux=b where x and b are dense.  x=b on input, solution on output. */
00003 int cs_usolve (const cs *U, double *x)
00004 {
00005     int p, j, n, *Up, *Ui ;
00006     double *Ux ;
00007     if (!CS_CSC (U) || !x) return (0) ;                     /* check inputs */
00008     n = U->n ; Up = U->p ; Ui = U->i ; Ux = U->x ;
00009     for (j = n-1 ; j >= 0 ; j--)
00010     {
00011         x [j] /= Ux [Up [j+1]-1] ;
00012         for (p = Up [j] ; p < Up [j+1]-1 ; p++)
00013         {
00014             x [Ui [p]] -= Ux [p] * x [j] ;
00015         }
00016     }
00017     return (1) ;
00018 }


hogman_minimal
Author(s): Maintained by Juergen Sturm
autogenerated on Mon Oct 6 2014 00:06:58