Second set of y-axis labels for same data

I am plotting sensor output (voltage vs. time). I want to add a secondary y-axis that shows the same sensor output converted to physical units (not voltage). Is there a good way to do this?

I looked at the examples for yyaxis. They show how to plot dissimilar data on the same x-axis. This is not what I want!

Answer 1

[Chunru]

yyaxis left
plot(randn(10,1))
ylabel('Original Unit')
xl_orig = xlim;
yl_orig = ylim;
yyaxis right
%plot(xl_orig, nan(1,2));
ylim(yl_orig*3);        % 3 is factor for the new unit
ylabel('New Unit (x3)')