Here's an example of creating a pair of axes, one with a histogram and one with a line.
% Sample data
x = randn(1, 1e5);
% Create the histogram on the left axes
yyaxis left
h = histogram(x);
% Make the right axes active
yyaxis right
% Get some data from the histogram
% If you already know the data you want to plot you can skip this step
binvalues = h.BinCounts;
binedges = h.BinEdges;
bincenters = (binedges(1:end-1)+binedges(2:end))/2;
% Plot the line on the right axes (since it's the active axes)
plot(bincenters, binvalues, '--')
You should see that the line on the right axes touches the histogram bars at their centers.
If you are using yyaxis and unable to show both the histogram and the other curve, can you show a small sample of your code that tries to show the other curve?
