New question #153591 on DOLFIN:
https://answers.launchpad.net/dolfin/+question/153591
I need the coordinates relative to the middle of the cell in my form, so I came
to the idea of
class cellcoords(Expression):
def eval(self, out, x):
out[0] = x[0]-self.??().midpoint()
out[1] = x[1]-self.??().midpoint()
out[2] = x[2]-self.??().midpoint()
def value_shape(self):
return (3,)
x = cellcoords()
where my lack of programming knowledge restricts me to the question marks ! I
dig in the Mesh...h but could not find out..
How can I reach to a method (midpoint() ) in MeshEntity class from the
Expression (I think self. directs me to the MeshData class) ?
any other method is also welcome.
Thanks a lot,
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