[petsc-users] a question about MatSetValue

[Yang Bo (Asst Prof)]

Hi Everyone,

I have a question about adding values to the matrix. The code I have is


for (int i=0;i<row.size();i++) {
MatSetValue(A,row[i],column[i],h[i],INSERT_VALUES);
}

where row.size() is a large number. It seems the running time of this procedure does not scale linearly with row.size(). As row.size() gets bigger, the time it takes increases exponentially. Am I doing something wrong and can I do better than that?

Thanks and stay healthy!

Cheers,

Yang Bo
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