15 lines
360 B
C
15 lines
360 B
C
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void dsprstx(double sa[], unsigned long ija[], double x[], double b[], unsigned long n)
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{
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void nrerror(char error_text[]);
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unsigned long i,j,k;
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if (ija[1] != n+2) nrerror("mismatched vector and matrix in dsprstx");
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for (i=1;i<=n;i++) b[i]=sa[i]*x[i];
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for (i=1;i<=n;i++) {
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for (k=ija[i];k<=ija[i+1]-1;k++) {
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j=ija[k];
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b[j] += sa[k]*x[i];
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}
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}
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}
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