23 lines
335 B
C
23 lines
335 B
C
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#include <math.h>
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void choldc(a,n,p)
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float **a,p[];
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int n;
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{
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void nrerror();
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int i,j,k;
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float sum;
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for (i=1;i<=n;i++) {
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for (j=i;j<=n;j++) {
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for (sum=a[i][j],k=i-1;k>=1;k--) sum -= a[i][k]*a[j][k];
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if (i == j) {
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if (sum <= 0.0)
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nrerror("choldc failed");
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p[i]=sqrt(sum);
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} else a[j][i]=sum/p[i];
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}
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}
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}
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