Computes the explicit matrix representation of a give matrix that can apply MatMultTranspose()
PetscErrorCode MatComputeOperatorTranspose(Mat inmat,MatType mattype,Mat *mat)
Collective on Mat
inmat -the matrix
mat -the explict operator transposed
This computation is done by applying the transpose of the operator to columns of the identity matrix.
This routine is costly in general, and is recommended for use only with relatively small systems.
Currently, this routine uses a dense matrix format if mattype == NULL.
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