On Tue, Oct 06, 2009 at 10:07:59AM -0500, Andy Ray Terrel wrote: > In previous versions of DOLFIN, a user was able to define a function > (overloading eval) and then use it in several forms, even when the > forms had different function spaces. It seems that currently a > FunctionSpace gets attached to the user function and then I get a > runtime error when it is used in another form. Is there a way to tell > the function to delete the current function space? > > Any help is appreciated.
Which version are you using? 0.9.3 or hg tip? We've been redesigning the function classes since 0.9.3 to make these things work better. In particular, a user must now subclass a new class named Expression which never has a FunctionSpace attached to it so you should be able to use it in many forms, as long as the shape (rank and dimension) of the expression matches. -- Anders
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