Hi David,

try looking at [1], specifically at:

def get_load(ts, coors, mode=None, **kwargs): if mode == 'qp': return {'val' : _get_load(coors).reshape(coors.shape[0], 1, 1)}

 load = Material('load', function=Function('get_load', get_load))

in function create_local_problem() (you can ignore the other code).

What you did was almost ok, just use the keyword argument (function=...) for the function.

The interactive use is not well documented, so it is often necessary to go through the (interactive) examples as well as look at the function/class docs (the search button on the website may come handy).

r.

[1] http://sfepy.org/doc-devel/examples/diffusion/poisson_parallel_interactive.h...

On 12/21/2016 08:48 PM, David Jessop wrote:

Hi,

I'm trying to solve a non-linear Poisson type equation where the diffusion coefficient/conductivity depends on the field variable. Logically, I've tried basing this part of my code on the poisson_field_dependent_material.py case and, of course, it works nicely in "simple" mode but I can't figure out how to pass the value to my material variable "cond" in interactive mode (I require interactive mode for reasons stated in this post https://groups.google.com/forum/#!topic/sfepy-devel/es64x4YFEiU). I define the same get_conductivity function as per poisson_field_dependent_material.py, then declare the function as conductivity_fun = Function('conductivity_fun', get_conductivity)

get_conductivity returns a dictionary key/value pair {'val' : val} so I figured to call the function as per cond = Material('cond', conductivity_fun)

should work, but it results in this error: Traceback (most recent call last): File "examples/diffusion/myPoisson/myPoissonInteractive.py", line 185, in <module> main() File "examples/diffusion/myPoisson/myPoissonInteractive.py", line 116, in main cond = Material('cond', conductivity_fun,) #val= 2.0) File "/usr/local/lib/python2.7/dist-packages/sfepy-2016.3_git_94dff5a051dbd2bf6bd56fce936d75878edef9e8-py2.7-linux-x86_64.egg/sfepy/discrete/materials.py" , line 148, in __init__ % self.name TypeError: not enough arguments for format string

I've also tried passing a function handle to cond ('conductivity_fun'), and all the possible combinations of function names that I can think of, but this error persists. I've looked at the function documentation http://sfepy.org/doc-devel/users_guide.html#functions but unfortunately this hasn't clarified things for me as this issue pertains specifically to the interactive problem specification.

Thank you for your help. Regards, David