[Matplotlib-users] please document imshow axes order

[Nathan Goldbaum]

This is discussed in the description of the "origin" keyword argument:

*origin* : {'upper', 'lower'}, optional

Place the [0,0] index of the array in the upper left or lower left corner
of the axes. The convention 'upper' is typically used for matrices and
images. If not given, rcParams["image.origin"]
<https://matplotlib.org/tutorials/introductory/customizing.html#matplotlib-rcparams>
is used, defaulting to 'upper'.

Note that the vertical axes points upward for 'lower' but downward for
'upper'.

On Thu, Jun 6, 2019 at 9:25 AM Neal Becker <ndbecker2 at gmail.com> wrote:

> I just wasted quite a bit of time trying to debug my code.  It took a long
> time because I was using imshow to debug, and didn't know that imshow
> displays a matrix not using cartesian coordinates.  The axes are
> transposed
> and one axis is reversed.  The documentation doesn't mention this.
>
> Thanks,
> Neal
>
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