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