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[Johan Hake <question105494@xxxxxxxxxxxxxxxxxxxxx>]

Question #105494 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/105494

Johan Hake posted a new comment:
Hi again!

Sorry for the incomplete answer. In dolfin 0.9.4 I think you have to pass the 
Function space using the keyword argument V=V when you instantiate your 
Expression.

  randf1 = myrand(V=V)

It's actually there in the error message ;)

In later dolfin version you only need to instantiate your Expression
using

  randf1 = myrand()

Johan

On Thursday March 25 2010 08:33:48 Achim Schroll wrote:
> Question #105494 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/105494
> 
>     Status: Answered => Open
> 
> Achim Schroll is still having a problem:
> Hi Johan, I don't get it. Expression gives the error...
> 
> class myrand(Expression):
>     def eval(self, values, x):
>         values[0] = gauss(0,1)
> 
> mesh = UnitSquare(20, 20)
> V = FunctionSpace(mesh, "CG", 1)
> 
> randf1 = myrand(V)
> 
> Traceback (most recent call last):
>   File "addnoise_ny.py", line 37, in <module>
>     randf1 = myrand(V)
>   File "/usr/lib/python2.5/site-packages/dolfin/expression.py", line 120,
> in __init__ raise TypeError, "Expression need to be initialized using
> either a 'cpp.FunctionSpace', using kwarg 'V', or an 'ufl.FiniteElement'
> using kwarg 'element'." TypeError: Expression need to be initialized using
> either a 'cpp.FunctionSpace', using kwarg 'V', or an 'ufl.FiniteElement'
> using kwarg 'element'.

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