not able to repeat solution for stokes-topology.py

Hi dolfin-adjoint developers,

I am currently learning this software. When I tried the stokes-topology.py example from dolfin-adjoint/examples/stokes-topology/, I got some TypeError. Since I did not installed mumps, I executed directly with python:

python stokes-topology.py

However, I got the error:

Traceback (most recent call last):
  File "stokes-topology.py", line 174, in <module>
    w   = forward(rho)
  File "stokes-topology.py", line 161, in forward
    bc = DirichletBC(W.sub(0), InflowOutflow(), "on_boundary")
  File "/home/bingxiao/anaconda2/envs/fenicsproject/lib/python2.7/site-packages/dolfin/functions/expression.py", line 268, in __init__
    degree, cell)
  File "/home/bingxiao/anaconda2/envs/fenicsproject/lib/python2.7/site-packages/dolfin/functions/expression.py", line 863, in _auto_select_element_from_shape
    raise TypeError("Expression needs an integer argument 'degree' if no 'element' is provided.")
TypeError: Expression needs an integer argument 'degree' if no 'element' is provided.

As a new learner, I do not know how to fix this problem.

I use 2016.2.0 both fenics and dolfin-adjoint. Many thanks in advance!

Comments (1)