Hi,
Just to add some more information:
The electrostatics algorithm used internally a complex FFT on real data, so that the result should be real as well. The code complains that it isn't, though the deviation is small. That typically means that there are strange charge distributions or parameters involved. If the simulation doesn't crash, then it is more likely a parameter problem (a finer agrid requires a smaller skin which might confuse the FFT).
Axel
Hi, this is an error message from the P3M (Electrostatics). This is an indication that something else is wrong. It would be easier to help you if you would post a minimal example that reproduces you problem. In principle you should be able to change agrid.
Cheers, Florian
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