[Numpy-discussion] new warning in 1.5.0: divide by zero encountered in log
John Reid
j.reid@mail.cryst.bbk.ac...
Wed Sep 8 05:38:24 CDT 2010
Hi,
I recently upgraded to numpy 1.5.0 and now I get warnings when I take
the logarithm of 0.
In [5]: np.log(0.)
Warning: divide by zero encountered in log
Out[5]: -inf
I want to evaluate x * log(x) where its value is defined as 0 when x=0
so I have the following function:
def safe_x_log_x(x):
"@return: x log(x) but replaces -inf with 0."
l = np.log(x)
result = x * l
result[np.isneginf(l)] = 0.
return result
Is there a better way of doing this that won't give me all these
warnings? Can I turn the warnings off?
Thanks,
John.
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