18 lines
318 B
C++
18 lines
318 B
C++
#include "nr.h"
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void NR::chint(const DP a, const DP b, Vec_I_DP &c, Vec_O_DP &cint, const int n)
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{
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int j;
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DP sum=0.0,fac=1.0,con;
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con=0.25*(b-a);
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for (j=1;j<n-1;j++) {
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cint[j]=con*(c[j-1]-c[j+1])/j;
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sum += fac*cint[j];
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fac = -fac;
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}
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cint[n-1]=con*c[n-2]/(n-1);
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sum += fac*cint[n-1];
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cint[0]=2.0*sum;
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}
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