dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

Thanks that worked just fine!

It turned out that derivative worked just fine! The bug I chased was a 
regression from my fix of the EpetraMatrix :P

But it is certainly nice to know that UFL differentiate nasty expressions just 
fine!

Johan


On Friday August 5 2011 04:48:52 Kristian Ølgaard wrote:
> Is printing the output from expand_derivatives good enough for you?
> 
> from ufl.algorithms import expand_derivatives
> element = FiniteElement("Lagrange", triangle, 1)
> u   = Coefficient(element)
> du = TrialFunction(element)
> v   = TestFunction(element)
> L1 = u**2*v*dx
> J1 = derivative(L1,u,du)
> print expand_derivatives(J1)
> 
> Kristian
> 
> On 5 August 2011 08:01, Johan Hake <johan.hake@xxxxxxxxx> wrote:
> > Hello!
> > 
> > I am suspecting that there are a bug in the differentiation algorithm.
> > How can I debug the result of a call to derivative(form)?
> > 
> > Johan
> > 
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