[petsc-users] Getting access to matrix rows without and setting values simultaneously

[Jed Brown]

On Thu, Jun 16, 2011 at 14:48, Alexander Grayver <agrayver at gfz-potsdam.de>wrote:

> by the grid I meant that this matrix is 2d array, not a real grid of some
> physical parameters or whatever and it's also not a linear operator itself.


Could you explain more about the task you're trying to do. Pseudocode or
Matlab for the whole process would be useful. There might be a better way to
do this without using Mat to store something that is not a linear operator.
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