plotyy2

The command plotyy is handy, but the implementation (superposing two plots on top of each other) present some problems. One of them is zooming, which does apply to only the uppermost plot (see screenshot, second plot).

This issue is know, and has no solution according to Mathworks (see refs below).

To address this, plotyy2 is a simple hack that adds a resize custom function to the figure generated by plotyy. On resize, the two x axis will be synchronized (see third plot on screenshot).

This is a non-automatic workaround, as manually resizing the figure is required after a zoom...

Reference to problem:
Solution Number: 1-15WA9
http://www.mathworks.com/support/solutions/data/1-15WA9.html