I'd like to plot two histograms on top of one another, but they have very different scales. Is it possible to plot a histogram with two y-axes, similar to the custom function found here for plots?

  • $\begingroup$ You can also plot a pdf Histogram[{d1, d2}, Automatic, "PDF"] but then you have to handle FrameTicks. $\endgroup$
    – Kuba
    Mar 29, 2015 at 22:37

1 Answer 1


More or less a duplicate of this answer, but just to demonstrate how it is used:

Some data:

d1 = RandomVariate[NormalDistribution[0, 1], 200];
d2 =  RandomVariate[NormalDistribution[0, 1], 1000];

Create the individual plots and then combine them using Overlay

optsall = {Axes -> False, Frame -> True, ImageSize -> 600, 
   BaseStyle -> {Thick, FontSize -> 14}};
opts1 = {ImagePadding -> {{Scaled[0.05], Scaled[0.11]}, {Scaled[0.04],
   FrameStyle -> {Thick, {Thick, Red}, Thick, Opacity[0]}, 
   FrameLabel -> {"x", "First y-label"}, 
   ChartStyle -> Directive[Opacity[0.5], Red]};
opts2 = {ImagePadding -> {{Scaled[0.05], Scaled[0.11]}, {Scaled[0.04],
   FrameStyle -> {Opacity[0], Opacity@0, Opacity@0, Blue}, 
   FrameTicks -> All, 
   FrameLabel -> ConstantArray["Second y-label", 4], 
   ChartStyle -> Blue};
Histogram[d1, Join[optsall, opts1]];
Histogram[d2, Join[optsall, opts2]];
Overlay[{%, %%}]

Mathematica graphics


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