dolfin team mailing list archive

[Johan Hake <hake@xxxxxxxxx>]

On Tuesday 21 April 2009 19:35:10 Martin Sandve Alnæs wrote:
> How can I set the name of a Function as it appears in a .pvd file?
> When looking at two fields simultaneously in paraview, they need
> separate names to have separate color ranges.
>
>
> In Python I get this when trying rename:
>
>
> In [16]: f.rename?
> Type:		instancemethod
> Base Class:	<type 'instancemethod'>
> String Form:	<bound method DiscreteFunction.Variable_rename of
> Function(FiniteElement('Lagrange', Cell('triangle', 1), 1), 0)>
> Namespace:	Interactive
> Docstring:
>     Variable_rename(Variable self, string name, string label)
>
>
> In [17]: f.rename("f", "m")
> ---------------------------------------------------------------------------
> TypeError                                 Traceback (most recent call last)
>
> /home/martinal/<ipython console> in <module>()
>
> TypeError: in method 'Variable_rename', argument 1 of type
> 'dolfin::Variable *'

I looked into this, and it turns out that it is a tricky one. 

It is caused by Variable not beeing declared as a shared_ptr class in the swig 
interface. Doing this would fix this but then we have to declare all other 
sub classes of Variable as shared_ptr stored. This is probably not what we 
want as there are quite a large number of classes inheriting Variable.

A hack that would fix this, at least the Function class in PyDOLFIN, is to 
add:

  cpp.Variable.__init__(self)

in the constructed __init__ function in function.py. This will initialise the 
correct proxy type for self. Not sure if this has any side effects though.


Johan




>
> No rush, I can of course just change the name in the .pvd file with
> sed for now...
>
> Martin
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