19 lines
307 B
C
19 lines
307 B
C
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void relax(u,rhs,n)
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double **rhs,**u;
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int n;
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{
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int i,ipass,isw,j,jsw=1;
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double h,h2;
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h=1.0/(n-1);
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h2=h*h;
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for (ipass=1;ipass<=2;ipass++,jsw=3-jsw) {
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isw=jsw;
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for (j=2;j<n;j++,isw=3-isw)
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for (i=isw+1;i<n;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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