On Fri, Mar 17, 2023 at 5:51 AM user_gong Kim <ksi2...@gmail.com> wrote:
> Hello,
>
>
>
> I have 2 questions about MatView.
>
>
>
> 1. I would like to ask if the process below is possible.
> When running in parallel, is it possible to make the matrix of the mpiaij
> format into a txt file, output it, and read it again so that the entire
> process has the same matrix?
>
No. However, you can do this with a binary viewer. I suggest using
MatViewFromOptions(mat, NULL, "-my_view");
and then the command line argument
-my_view binary:mat.bin
and then you can read this in using
MatCreate(PETSC_COMM_WORLD, &mat);
PetscViewerBinaryOpen(PETSC_COMM_WORLD, "mat.bin", FILE_MODE_READ,
&viewer);
MatLoad(mat, viewer);
ViewerDestroy(&viewer);
THanks,
Matt
> 2. If possible, please let me know which function can be used to
> create a txt file and how to read the txt file.
>
>
>
> Thanks,
>
> Hyung Kim
>
--
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
