[Numpy-discussion] Strange behavior of np.sinc
David Goldsmith
d.l.goldsmith@gmail....
Sat Jun 26 23:33:47 CDT 2010
Hi! The docstring for numpy.lib.function_base.sinc indicates that the
parameter has to be an ndarray, and that it will return the limiting value 1
for sinc(0). Checking to see if it should actually say array_like, I found
the following (Python 2.6):
>>> np.sinc(np.array((0,0.5)))
array([ 1. , 0.63661977])
>>> np.sinc((0,0.5))
array([ NaN, 0.63661977])
>>> np.sinc([0,0.5])
array([ NaN, 0.63661977])
>>> np.version.version
'1.4.1'
So, it doesn't choke on non-array sequences, and appears to return values
consistent w/ array input, except at 0. Bug in code (failure at 0 if in a
sequence) and in the doc (ndarray should be array_like)?
DG
--
Mathematician: noun, someone who disavows certainty when their uncertainty
set is non-empty, even if that set has measure zero.
Hope: noun, that delusive spirit which escaped Pandora's jar and, with her
lies, prevents mankind from committing a general suicide. (As interpreted
by Robert Graves)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.scipy.org/pipermail/numpy-discussion/attachments/20100626/a16f9b14/attachment-0001.html
More information about the NumPy-Discussion
mailing list