19 lines
337 B
C++
19 lines
337 B
C++
#include "nr.h"
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void NR::relax(Mat_IO_DP &u, Mat_I_DP &rhs)
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{
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int i,ipass,isw,j,jsw=1;
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DP h,h2;
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int n=u.nrows();
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h=1.0/(n-1);
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h2=h*h;
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for (ipass=0;ipass<2;ipass++,jsw=3-jsw) {
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isw=jsw;
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for (j=1;j<n-1;j++,isw=3-isw)
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for (i=isw;i<n-1;i+=2)
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u[i][j]=0.25*(u[i+1][j]+u[i-1][j]+u[i][j+1]
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+u[i][j-1]-h2*rhs[i][j]);
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}
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}
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