[aspect-devel] The syntax for the function expression

[Wolfgang Bangerth]

Nan,
as Max already pointed out, the fundamental issue is that this...

>     subsection Viscosity depth function
>       set Variable names      = r,phi,theta

...doesn't work because the depth function can only depend on one argument 
(the depth), not three. I agree that the error message is completely useless. 
I've opened a bug report here:
   https://github.com/dealii/dealii/issues/3107

Best
  W.

-- 
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Wolfgang Bangerth          email:                 bangerth at colostate.edu
                            www: http://www.math.colostate.edu/~bangerth/