16 lines
269 B
C++
16 lines
269 B
C++
#include "nr.h"
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void NR::chder(const DP a, const DP b, Vec_I_DP &c, Vec_O_DP &cder, const int n)
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{
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int j;
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DP con;
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cder[n-1]=0.0;
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cder[n-2]=2*(n-1)*c[n-1];
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for (j=n-2;j>0;j--)
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cder[j-1]=cder[j+1]+2*j*c[j];
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con=2.0/(b-a);
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for (j=0;j<n;j++)
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cder[j] *= con;
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}
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