cs_gaxpy.c
Go to the documentation of this file.00001 #include "cs.h" 00002 /* y = A*x+y */ 00003 int cs_gaxpy (const cs *A, const double *x, double *y) 00004 { 00005 int p, j, n, *Ap, *Ai ; 00006 double *Ax ; 00007 if (!CS_CSC (A) || !x || !y) return (0) ; /* check inputs */ 00008 n = A->n ; Ap = A->p ; Ai = A->i ; Ax = A->x ; 00009 for (j = 0 ; j < n ; j++) 00010 { 00011 for (p = Ap [j] ; p < Ap [j+1] ; p++) 00012 { 00013 y [Ai [p]] += Ax [p] * x [j] ; 00014 } 00015 } 00016 return (1) ; 00017 }