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Message #01983
Re: [Dolfin] Adding form names F and J
On Fri, Jul 01, 2011 at 11:07:15AM +0200, Martin Sandve Alnæs wrote:
> On 1 July 2011 09:05, Anders Logg <logg@xxxxxxxxx> wrote:
> > They are always generated as it is now, but I assume it would be
> > simple to make it so that they are only generated if they are used.
> >
> > I'm not sure there's a big chance they will be misunderstood. Users
> > will not know that the classes ResidualForm and JacobianForm are
> > defined if they don't read through the generated code. Users will only
> > know about them if they look at a nonlinear example and then it will
> > be clear how they should be used.
>
> Users rarely follow the train of thought they're supposed to :)
>
> I don't have a strong opinion either, do as you like.
ok. :-)
--
Anders
> Martin
>
> > But I don't have a firm opinion on this other than it's a natural
> > thing to have so that one can work with F and J for nonlinear problems
> > instead of a and L.
> >
> >
> >
> > On Fri, Jul 01, 2011 at 08:31:13AM +0200, Martin Sandve Alnæs wrote:
> >> Are the typedefs only generated if the forms are named F and J? My worry is
> >> that it could easily be misunderstood and misused.
> >> Martin
> >> Den 30. juni 2011 21.50 skrev "Anders Logg" <logg@xxxxxxxxx>
> >> følgende:
> >> > On Thu, Jun 30, 2011 at 06:35:19PM +0200, Anders Logg wrote:
> >> >> Could we add the additional form names "F" and "J" to
> >> UFL to be used
> >> >> for nonlinear problems? These would then be mapped (typedeffed) to
> >> >> "ResidualForm" and "JacobianForm" by the DOLFIN C++
> >> wrappers.
> >> >>
> >> >> Then one can use F and J in the .ufl file and then initialize the
> >> >> forms in C++ by
> >> >>
> >> >> NonlinearPoisson::ResidualForm F(V);
> >> >> NonlinearPoisson::JacobianForm J(V, V);
> >> >>
> >> >> instead of using L and a and then initializing by
> >> >>
> >> >> NonlinearPoisson::LinearForm F(V);
> >> >> NonlinearPoisson::BilinearForm J(V, V);
> >> >>
> >> >> Any objections?
> >> >
> >> > I didn't hear any objections and it sounded like a good idea so I have
> >> > added this now (will merge into main when the buildbot is green).
> >> >
> >> > In short, I've made a small change to UFL to allow 'F' and 'J' to be
> >> > used in form files and a small change in the DOLFIN wrapper code
> >> > generators to generate typedef aliases:
> >> >
> >> > BilinearForm = JacobianForm
> >> > LinearForm = ResidualForm
> >> >
> >> > So nothing should break for old code. One can still use BilinearForm
> >> > and LinearForm for nonlinear problems, but no in addition the more
> >> > logical ResidualForm and JacobianForm.
> >> >
> >> >
> >> > _______________________________________________
> >> > Mailing list: https://launchpad.net/~dolfin
> >> > Post to : dolfin@xxxxxxxxxxxxxxxxxxx
> >> > Unsubscribe : https://launchpad.net/~dolfin
> >> > More help : https://help.launchpad.net/ListHelp
> >
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