How do I make multiple x axes?

I am trying to create a plot with two x axes. One at the top and one at the bottom. The y axis has the same range.

I have salinity and temperature of a water column and the depth is on the y axis. I would like to make salinity and temperature different x axes.

Thanks in advance

Answer 1

[A Jenkins]

Did you try the searching the File Exchange? There is a plotxx there you can download.

Answer 2

[José-Luis]

You could try a variation of the below:

 aH(1) = axes;
 aH(2) = axes;

 y1 = rand(10,1);
 y2 = rand(10,1);
 x=(1:10)';

 plot(aH(1),x,y1,'Color',rand(1,3));
 plot(aH(2),x,y2,'Color',rand(1,3));

 linkaxes(aH,'x')
 set(aH(2),'Color','none','XAxisLocation','top','YAxisLocation','right');