On Mon, Jun 19, 2017 at 11:15 AM, Adrien F. Vincent < ***@***.***> wrote: It looks to me that the problem may come from this section <https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/axes/_axes.py#L6102> in axes.hist: for i in xrange(nx): # this will automatically overwrite bins, # so that each histogram uses the same bins m, bins = np.histogram(x[i], bins, weights=w[i], **hist_kwargs) If the bins parameter that is initially passed to hist is “auto¹”, then bins becomes a sequence after the first iteration, and this iteration will be kept during the following runs. My first idea would be to just add some supplementary logic (in the loop?) to take care of the case of bins being a string. ¹ : maybe I am wrong, but one could pass any string that is valid for numpy.histogram, don't we? Is it deliberate to not mention it in ax.docstring? Otherwise, it looks like a pretty kind nice but unfortunately hidden feature ^^. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#8778 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-GhOb8cYoyVtegtxfo1tfGy9R1xaks5sFpClgaJpZM4N-WCA> .