[Numpy-discussion] Adding "maximum difference" to np.testing.assert_array_equal errors

[Juan Nunez-Iglesias]

Another +1 on printing rtol, and +100 (can I do that?) on the overall idea! Thanks Stephan!

On Thu, Dec 20, 2018, at 7:27 AM, Christoph Deil wrote:
> 
> 
> > On 19. Dec 2018, at 19:50, Stefan van der Walt <stefanv at berkeley.edu> wrote:
> > 
> > On Wed, 19 Dec 2018 09:47:01 -0800, Stephan Hoyer wrote:
> >> Example behavior:
> >> 
> >>>>> x = np.array([1, 2, 3])
> >>>>> y = np.array([1, 2, 3.0001])
> >>>>> np.testing.assert_allclose(x, y)
> >> AssertionError:
> >> Not equal to tolerance rtol=1e-07, atol=0
> >> 
> >> (mismatch 33.333333333333336%, maximum difference
> >> 0.00010000000000021103)
> > 
> > This is a helpful addition; thank you!  I don't have a strong preference
> > around whether to also include rtol.
> > 
> > Stéfan
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> 
> +1 to this addition.
> 
> And +1 to also print rtol.
> I frequently use rtol with assert_allclose, and having the value 
> printed helps quickly choose an appropriate value.
> 
> Christoph
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