[petsc-users] Customizeing MatSetValuesBlocked(...)

[Jed Brown]

On Wed, Aug 8, 2012 at 1:00 PM, Jinquan Zhong <jzhong at scsolutions.com>wrote:

> This makes sense to me.  I thought the preallocation only applies to
> MatCreateMPIAIJwithArrays(…) and other more complicate functions.****
>
> ** **
>
> The matrix coming out from ScaLAPACK will be repopulated into a sparse
> matrix in a much large scale.
>

I don't understand this exactly. You are taking the entries of the dense
matrix and putting them into a much larger sparse matrix? In that case, you
probably never need Elemental, but you definitely need to preallocate.


> Do I need to install elemental package in PETSc in order to use
> MATELEMENTAL?
>

Yes, just configure petsc-dev with --download-elemental.
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