[petsc-users] getting a sub matrix from a matrix

[Nachiket Gokhale]

I have a dense matrix A  (100x100)   and I want to extract a matrix B from
it consisting of the first  N columns of A.   Is there a better way to do
it than getting the column using MatGetColumnVector, followed by
VecGetArray,  and MatSetValues?  It could also be done using
MatGetSubMatrix but is seems to be more involved.

Thanks,

 -Nachiket
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