Oh, thank you very much!!!
I was so stupid!!
I thought that "system_matrix_tmp = system_matrix" is the same as
"system_matrix_tmp.copy_from(system_matrix)"
Thank you.
Kyusik.
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On 4/26/19 8:04 PM, hanks0...@gmail.com wrote:
>
>
> The several components in the matrix A_ij change to 0 or 1, and these changed
> values are used in assembling the system_rhs.
> (if it is wrong please let me know what is the reason)
>
> So, my question is reassembling the system_matrix
