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isnan, isposinf and isneginf do not accept fractions.Fraction #15517

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francois-durand opened this issue Feb 5, 2020 · 2 comments
Open

isnan, isposinf and isneginf do not accept fractions.Fraction #15517

francois-durand opened this issue Feb 5, 2020 · 2 comments
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33 - Question Question about NumPy usage or development component: numpy.ufunc

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@francois-durand
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The functions isnan, isposinf and isneginf do not accept a fraction as an argument. Note that, however, math.nan accepts a fraction (but the math module has the drawback of not having the equivalent of isposinf and isneginf).

Reproducing code example:

import numpy as np
from fractions import Fraction
test = np.isnan(Fraction(1, 2))

Error message:

TypeError                                 Traceback (most recent call last)
<ipython-input-1-bead9135402d> in <module>
      1 import numpy as np
      2 from fractions import Fraction
----> 3 np.isnan(Fraction(1, 2))

TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

Numpy/Python version information:

1.16.4 3.7.3 (default, Apr 24 2019, 15:29:51) [MSC v.1915 64 bit (AMD64)]
@rossbar rossbar added component: numpy.ufunc 33 - Question Question about NumPy usage or development labels Jul 17, 2020
@rossbar
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rossbar commented Jul 17, 2020

Related discussion in #12988 and #16377, particularly this comment which gets at the larger issue of why no object loops are defined for these functions.

@francois-durand
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Thanks for the links!

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