This function function often result in incorrect output when the cpu is very loaded. I do not know how to trace the bug since every "single shot" use, or step by step trace gives the correct answer, also when running scripts under "ipython -pdb" solves the problem. System:

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numpy.__version__ '1.4.0.dev7400'

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scipy.__version__ '0.8.0.dev5922'

Python 2.6.2 (64 bits) numpy/scipy are built with atlas support. OS: Gentoo linux (I use two independent (not a clone of each other) machines). Sorry for posting it on the numpy list, but anyway this is not the first cross-lists post. Nadav