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 is necessary...?
Not really. You will want to use something like what is done in step-26 where
we store the matrix (actually, matrices) without boundary values applied, and
in each time step copy them into system_matrix and apply boundary values. I
suspect that this is what you also want to do in your case.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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