[petsc-users] MatGetSubMatrices or VecCreateGhost

[Jed Brown]

Bikash Kanungo <bikash at umich.edu> writes:
> Matrix A defined in my problem is of size NxN and I have N vectors v_i,
> each of length N, which are to be multiplied by A. N is fairly small
> 10000-50000.

Your vectors form a square matrix, so I would use MatMatMult.  If the
number of vectors was much smaller than their size (e.g., 10), then
alternatives might make sense.
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