[ff3d-dev] Re: how to use "function"

[Stephane Del Pino]

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Dear Robert.

It is possible to do all that you asked for but not in the order you set it in 
your file. Unknowns can be used as standard functions after their declaration 
(that can be performed by a solve(u)). I will try to be more precise thanks 
to an example:
- ------
solve(u) {
...
}

function v = u+1; // does what is expected
u = x+y; // redefines u but v keeps the 'solution value' + 1!
- ------

Difference between femfunction and function is that femfunction are finite 
element functions defined by a mesh. So writing
femfunction u(M) = x+sin(y);
will project the 'x+sin(y)' function on the finite element space of functions 
living on the mesh M.

I hope that helps. I will try to make the documentation as clear as possible 
on that topic.

Regards,
Stephane.
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