16 lines
302 B
C
16 lines
302 B
C
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void lop(double **out, double **u, int n)
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{
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int i,j;
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double h,h2i;
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h=1.0/(n-1);
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h2i=1.0/(h*h);
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for (j=2;j<n;j++)
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for (i=2;i<n;i++)
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out[i][j]=h2i*(u[i+1][j]+u[i-1][j]+u[i][j+1]+u[i][j-1]-
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4.0*u[i][j])+u[i][j]*u[i][j];
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for (i=1;i<=n;i++)
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out[i][1]=out[i][n]=out[1][i]=out[n][i]=0.0;
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}
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