Preallocating Matrix

[Andreas Grassl]

Hello,

I'm assembling large matrices giving just the numbers of zero per row and
wondering if it is possible to extract the nonzero-structure in array-format it
can be fed again into

MatSeqAIJSetPreallocation(Mat B,PetscInt nz,const PetscInt nnz[])

to detect the bottleneck?

cheers

ando

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