On Thu, Mar 05, 2009 at 02:40:51PM -0500, Hatef Monajemi wrote: > regardless of what operator you use ffc gives the following error: > > > > "Dimensions don't match for scalar product." > > > > try for example : > > > > (v,w)= (v+v, w) > > Is there a way to get around this? > > Hatef
I checked and the problem is that v is a Python list with two elements v = [v[0], v[1]] When you write v + v, the Python operator for addition of lists will kick in and give a new Python list: v = [v[0], v[1], v[0], v[1]] so the dimensions won't match when you take the inner product. If you want to have v --> v + delta*grad(q), you can do something like v = [v[i] + delta*grad(q)[i] for i in len(v)] This will be much better handled in upcoming versions of FFC which will use the new form language UFL. -- Anders
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