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Re: [Question #135590]: formtransformations.py : Found basis function in %s, this is an invalid expression

To: dolfin@xxxxxxxxxxxxxxxxxxx
From: Marie Rognes <question135590@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 26 Nov 2010 17:04:37 -0000
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Question #135590 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/135590

    Status: Open => Answered

Marie Rognes proposed the following answer:

d2 is not just a number, it is a nonlinear function of d (and v)

Since your operator sigma is not linear in v, you do not want to treat
this as a linear variational problem. In particular, you probably want
to define v is a Function instead of as a TrialFunction. For more
details, take a look at some of the nonlinear demos, for instance

    demo/pde/hyperelasticity

--
Marie

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