Hi, I'm running the
examples/levelSet/electroChem/inputSimpleTrenchSystem.py scrip. After
it draws the surface contour for four steps on mayavi, the console
echos the following warning at each step:

/home/yhlu/local/lib/python/fipy/models/levelSet/surfactant/surfactantEquation.py:96:
StagnatedSolverWarning: The solver stagnated. Iterations: 2. Relative
error: nan
  solver = solver)
inputSimpleTrenchSystem.py:365: StagnatedSolverWarning: The solver
stagnated. Iterations: 1. Relative error: nan
  boundaryConditions = metalEquationBCs)
inputSimpleTrenchSystem.py:367: StagnatedSolverWarning: The solver
stagnated. Iterations: 1. Relative error: nan
  boundaryConditions = catalystBCs)
inputSimpleTrenchSystem.py:362: StagnatedSolverWarning: The solver
stagnated. Iterations: 1. Relative error: nan
  advectionEquation.solve(distanceVar, dt = dt)

UnstructuredGrid.<module>.runSimpleTrenchSystem.plot.tofile.to_string.to_string.get_datatype.warning:
        no data, no datatype, using int

And then the following trench curves don't show on mayavi any more. It
seems to be the problem with the linear solver. I'm using pySparse
1.0. Does anyone know what's wrong?

-- 
Sincerely,
Yinghai

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