How to insert two X axis in a Matlab a plot

Question

I would like create a Matlab figure with a double X axis (m/s and km/h) with the same plot.

I have found plotyy and - in Matlab reposity - plotyyy, but I am looking

Answer 1

The best way i can think to do it is to use 2 plots, for example, you can split the plot into a large and small section by doing something like this:

subplot(100, 1, 1:99) // plot your graph as you normally would
plot(...

subplot(100, 1, 100) // Plot a really small plot to get the axis
plot(...)
b = axis()
axis([b(1:2), 0, 0]) // set the y axis to really small

This is untested, you might need to fiddle around a little but it should hopefully put you on the right track.