Hi Ben--

I am having the same problem.  When I define tol, maxiters, and L 
in the Scheme function call, this error is returned.  There is 
different behavior when you call the function without the 
additional arguments:

(init-fields)
(meep-fields-solve-cw fields)

For small values of lattice resolution, the program returns seemingly 
without having calculated anything:
"on time step 1 (time=0.025), 6.12478 s/step
final residual = 0
Finished solve_cw after 1 steps and 0 CG iters."

For large values of resolution, segmentation faults are returned and 
the calculation breaks.


This is unfortunate because this feature is really interesting and 
would be helpful to my work.  Does anyone have any other ideas 
about how this function works?

Thanks,

Rob


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