[Numpy-discussion] assert_almost_equal bug?

Ralf Gommers ralf.gommers@googlemail....
Sat Mar 12 06:16:38 CST 2011


On Sat, Mar 12, 2011 at 12:10 AM, Keith Goodman <kwgoodman@gmail.com> wrote:
> assert_almost_equal() and assert_array_almost_equal() raise a
> ValueError instead of an AssertionError when the array contains
> np.inf:

That's a bug, is fixed in 45269ee1. assert_array_compare was checking
for nans but not for infs.

Cheers,
Ralf


>
>>> a = np.array([[1., 2.], [3., 4.]])
>>> b = a.copy()
>>> np.testing.assert_almost_equal(a, b)
>>> b[0,0] = np.inf
>>> np.testing.assert_almost_equal(a, b)
> <snip>
> ValueError:
> Arrays are not almost equal
>  x: array([[ 1.,  2.],
>       [ 3.,  4.]])
>  y: array([[ inf,   2.],
>       [  3.,   4.]])
>>> np.testing.assert_array_almost_equal(a, b)
> <snip>
> ValueError:
> Arrays are not almost equal
>  x: array([[ 1.,  2.],
>       [ 3.,  4.]])
>  y: array([[ inf,   2.],
>       [  3.,   4.]])
>
> ticket: http://projects.scipy.org/numpy/ticket/1769
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