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Thanks, both of you. Lesson learnt.

2. Ranges should be ok. Otherwise, I would rather expect a seg fault or similar, but not a crash that seems to happen randomly? I might be wrong, though.

1. Not sure what you exactly you mean by...

Hi folks,
I'm writing a small simulation of bouncing hard spheres using the Metropolis algorithm. Now my problem is that the program runs fine almost always, also when I vary certain parameters....