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[Question #127978]: User-defined function in a nonlinear problem

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From: Vladimir <question127978@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 05 Oct 2010 07:24:46 -0000
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New question #127978 on DOLFIN:
https://answers.launchpad.net/dolfin/+question/127978

Hello

I want to solve a nonlinear PDE. In a variational formulation I have this nonlinear function of a trial function: a(u) = sgn(u)*pow(abs(u),n), where n doesn't have to be a natural number. I'd like to have this function even for negative values of u (and so I can't use simply pow(x,y)). How can I define such function?

In general, how do you define a " more complicated " function which takes as an argument Function object (e.g. piecewise linear or a function which can't be defined by simple use of pow, sin, cos...) ?

Thank you for any advice in advance
Vlado

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