18 lines
396 B
C
18 lines
396 B
C
#include "cs.h"
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/* y = A*x+y */
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int cs_gaxpy (const cs *A, const double *x, double *y)
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{
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int p, j, n, *Ap, *Ai ;
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double *Ax ;
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if (!CS_CSC (A) || !x || !y) return (0) ; /* check inputs */
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n = A->n ; Ap = A->p ; Ai = A->i ; Ax = A->x ;
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for (j = 0 ; j < n ; j++)
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{
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for (p = Ap [j] ; p < Ap [j+1] ; p++)
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{
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y [Ai [p]] += Ax [p] * x [j] ;
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}
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}
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return (1) ;
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}
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