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Description
TheAxes.hist method doesn't handle thebottom kwarg properly when givenlog=True andhisttype='step' orhisttype='stepfilled'. As the example below shows, the method sets aminimum value to prevent issues with zeros on a log scale, but that supercedes a non-zerobottom kwarg:
importnumpyfrommatplotlibimportpyplotfig=pyplot.figure()ax=fig.gca()ax.hist(numpy.random.random(1000),bins=100,log=True,bottom=1e-2,histtype='stepfilled')ax.set_ylim(1e-2,1e3)ax.set_title('Bottom should be 1e-2, but instead is 1/base')
I can correct the issue with the following edit:
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.pyindex 4d10e86..2392a6d 100644--- a/lib/matplotlib/axes/_axes.py+++ b/lib/matplotlib/axes/_axes.py@@ -5779,7 +5779,9 @@ class Axes(_AxesBase): logbase = self.yaxis._scale.base # Setting a minimum of 0 results in problems for log plots- if normed or weights is not None:+ if np.min(bottom) > 0:+ minimum = np.min(bottom)+ elif normed or weights is not None: # For normed data, set to log base * minimum data value # (gives 1 full tick-label unit for the lowest filled bin) ndata = np.array(n)
which uses thebottom value to set theminimum if it's nonzero. If this is confirmed as a bug, I can open a PR.
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