8000 Convert isposinf and isneginf from 'ufunclike' to proper ufunc objects (Trac #876) · Issue #1474 · numpy/numpy · GitHub
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Convert isposinf and isneginf from 'ufunclike' to proper ufunc objects (Trac #876) #1474

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numpy-gitbot opened this issue Oct 19, 2012 · 4 comments
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Convert isposinf and isneginf from 'ufunclike' to proper ufunc objects (Trac #876) #1474

numpy-gitbot opened this issue Oct 19, 2012 · 4 comments
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17 - Task component: numpy._core

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@numpy-gitbot
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Original ticket http://projects.scipy.org/numpy/ticket/876 on 2008-08-06 by @bsouthey, assigned to unknown.

Both isposinf() and isneginf() return only return a boolean array. In contrast, both isinf() and isnan() return a numpy boolean for a scalar input and a numpy boolean array for array-like input.

import numpy as np
np.__version__            # returns: '1.1.0'
type(np.isinf(np.inf))    # returns: <type 'numpy.bool_'>
type(np.isposinf(np.inf)) # returns: <type 'numpy.ndarray'>
type(np.isneginf(np.inf)) # returns: <type 'numpy.ndarray'>
@numpy-gitbot
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@mwiebe wrote on 2011-03-23

This is because isposinf and isneginf are not ufuncs, they're in numpy.lib.unfunclike instead. The fix is to convert them to proper ufuncs.

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Title changed from Both isposinf and isneginf return an array for a scalar input to Convert isposinf and isneginf from 'ufunclike' to proper ufunc objects by @mwiebe on 2011-03-23

@eric-wieser
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As of #8996, all three functions return a bool_ scalar for 0d array input.

@mhvk
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mhvk commented May 4, 2017

Closing given the fix in #8996.

@mhvk mhvk closed this as completed May 4, 2017
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