dolfin team mailing list archive

Thread
Date

Re: [Question #102925]: operator that depends on the gradient of a function

To: dolfin@xxxxxxxxxxxxxxxxxxx
From: Richard Norton <question102925@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 09 Mar 2010 17:11:56 -0000
Reply-to: question102925@xxxxxxxxxxxxxxxxxxxxx
Sender: bounces@xxxxxxxxxxxxx

Question #102925 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/102925

Richard Norton gave more information on the question:
Equivalently, would it be possible to define a function/expression that
is piecewise constant in the following way...

Given u = Function(V), V = FunctionSpace(mesh,"CG",1), the expression
returns a vector valued function where each component is in
FunctionSpace(mesh,"DG",0) so that if abs(u.dx(1)) < 1 in a triangle of
the mesh then as_vector( [u.dx(0), 0]) is returned else as_vector(
[u.dx(0), 2*(u.dx(1)**2 -1)*u.dx(1)] ) is returned.

Is u.dx(0) a function in FunctionSpace(mesh,"DG",0)?

-- 
You received this question notification because you are a member of
DOLFIN Team, which is an answer contact for DOLFIN.