[petsc-users] Providing matrix vector product yourself for matrix free in SNES

[E.T.A.vanderWeide at utwente.nl]

> You need to pass a valid address. Show us what this code looks like. It
> should be something like

> MyContext *ptr;
> MatShellGetContext(mat,&ptr);

That's it. I just sent ptr not &ptr. It is working now.

Thanks,

Edwin
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