[Numpy-discussion] Warnings not raised by np.log in 32 bit build on Windows

Warren Weckesser warren.weckesser@gmail....
Thu Aug 22 21:32:16 CDT 2013

I'm investigating a test error in scipy 0.13.0 beta 1 that was
reported by Christoph Gohlke.  The scipy issue is here:

I don't have a Windows environment to test it myself, but Christoph
reported that this code:

import numpy as np

data = np.array([-0.375, -0.25, 0.0])
s = np.log(data)

does not generate two RuntimeWarnings when it is run with numpy 1.7.1
in a 32 bit Windows 8 environment (numpy 1.7.1 compiled with Visual
Studio compilers and Intel's MKL).  In 64 bit Windows, and in 64 bit
linux, it generates two RuntimeWarnings.

The inconsistency seems like a bug, possibly this one:

Can anyone check if this also occurs in the development branch?


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