[petsc-dev] coding style

Barry Smith bsmith at mcs.anl.gov
Thu Aug 18 12:48:06 CDT 2016

> On Aug 18, 2016, at 11:52 AM, Jed Brown <jed at jedbrown.org> wrote:
> Barry Smith <bsmith at mcs.anl.gov> writes:
>>   Seems reasonable. Note for SNES we have something similar in that user can solve either F(x) = b or F(x) - b = 0 depending on if they provide the b explicitly.
> I'd just say that the algorithm should still work correctly if the user
> doesn't separate everything since that can be inefficient (multiple
> communications and passes over memory) and/or unnatural.  How does the
> algorithm work if the user has only g(x)?  Would they need to define
>  H := \nabla^2 g(x)
>  f(x) = g(x) - x'*H*x
> so that you can put it back together?

  No, don't want to require that.

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