[petsc-users] MatSetValues vs. MatSetValue

[Jed Brown]

Qin Lu <lu_qin_2000 at yahoo.com> writes:

> Hello,
>  
> I need to set values of a sparse matrix. Is setting coefficients row
> by row using MatSetValues more efficient than setting setting
> coefficient one by one using MatSetValue? 

Somewhat more efficient, yes.

> Is MatSetValues implemented by looping over each entry of the input
> array calling MatSetValue? 

Calling for a group of entries (once per row or once per "element" in
finite element methods) amortizes some of the search cost.
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