[petsc-users] How to get Matrix from MatGetArray()

[Jed Brown]

On Sat, Oct 1, 2011 at 10:23, behzad baghapour
<behzad.baghapour at gmail.com>wrote:

> I meant by MatAssembly, the global indices of matrix elements (related to a
> dense format) which is changed into sparse one.


I don't understand what you mean. It doesn't make sense to convert "dense"
indices into sparse ones.


> So what would be right pattern to read the content of the Matrix from
> MatGetArray if I know that the original matrix is created by AIJ?


Use MatGetRow() if you need access to this. (The internal data structures
are different in parallel and serial, so accessing them directly is bad.)
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