[petsc-users] PCComposite

[Jed Brown]

On Mon, May 28, 2012 at 10:25 AM, Hui Zhang <mike.hui.zhang at hotmail.com>wrote:

> But I'm not *changing* the operator. It is PCSetUp_Composite that call
> PCSetOperators on sub pc
> a second time-- he does not know that the sub pc has been set up before.
>

Why do you call PCSetUp the first time?

We don't currently have a mechanism to automatically know whether the
operator has changed since the last setup, that's what the flag argument is
for.
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