I'm sorry, please let me ask you one more question....
> Why is that expected? It should be the same. The new sparsity_pattern
> should be the same as the old one
>
>
> According to your comment, I remove system_matrix.reinit(sparsity_pattern)
only (system_rhs.reinit and solution.reinit are not removed)
The result is as follows...
Number of active cells: 5120
Number of degrees of freedom: 20609
iteration 0
||u_{k}-u_{k-1}||42.5271
iteration 1
||u_{k}-u_{k-1}||30.1063
iteration 2
||u_{k}-u_{k-1}||11.1065
iteration 3
||u_{k}-u_{k-1}||0.159375
iteration 4
||u_{k}-u_{k-1}||0.0176957
iteration 5
||u_{k}-u_{k-1}||0.0149181
iteration 6
||u_{k}-u_{k-1}||0.0129168
iteration 7
||u_{k}-u_{k-1}||0.0113656
iteration 8
||u_{k}-u_{k-1}||0.0101467
iteration 9
||u_{k}-u_{k-1}||0.00916819
It seems that the error is greatly reduced... So, It seems that I can't
ignore this difference.
Could you please explain to me what makes this big difference??
Thank you
Kyusik.
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