29 lines
449 B
C++
29 lines
449 B
C++
#include "nr.h"
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void NR::polcoe(Vec_I_DP &x, Vec_I_DP &y, Vec_O_DP &cof)
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{
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int k,j,i;
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DP phi,ff,b;
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int n=x.size();
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Vec_DP s(n);
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for (i=0;i<n;i++) s[i]=cof[i]=0.0;
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s[n-1]= -x[0];
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for (i=1;i<n;i++) {
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for (j=n-1-i;j<n-1;j++)
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s[j] -= x[i]*s[j+1];
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s[n-1] -= x[i];
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}
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for (j=0;j<n;j++) {
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phi=n;
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for (k=n-1;k>0;k--)
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phi=k*s[k]+x[j]*phi;
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ff=y[j]/phi;
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b=1.0;
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for (k=n-1;k>=0;k--) {
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cof[k] += b*ff;
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b=s[k]+x[j]*b;
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}
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}
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}
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