How to extract the the matrix A in crs format

[ztdep...@gmail.com]

I want to extract the matrix A and rhs in crs format , and pass them to my own solver. Could you pleae give me some advices. 

[Wolfgang Bangerth]

On 10/31/22 09:16, ztdep...@gmail.com wrote:
> **

>
> I want to extract the matrix A and rhs in crs format , and pass them to my own
> solver. Could you pleae give me some advices.

The SparseMatrix class has various print functions that output the matrix in a
variety of ways. You can use those to obtain a representation of the matrix
that you can then read back in elsewhere.

Note that there is no "crs format" in the sense that there would be an
agreed-upon file format. CRS is a data structure, and it can be written into
files in many different ways. So if you're expecting a specific file format,
you have to state which one you mean and how it is defined.

Best
W.

--
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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/