On 09/10/2010 10:54 AM, Brian Larsen wrote:
> Hello all,
>
> I feel like this is possible but I am having trouble figuring it out.
>
> I want to put extra labels on the ticks on the xaxis like in the upper
> panel of the figure
> http://sprg.ssl.berkeley.edu/fast/graphics/socfig1.gif
>
> Following
> http://matplotlib.sourceforge.net/examples/axes_grid/demo_parasite_axes2.html
> doesn't seem to be the right thing.
>
> It seems that I can get the tick values from
> ax= gca()
> ax.get_xticks()
>
> and from here do the calculations on what the other labels should be
> (interpolate the spacecraft position).
>
> but then how do a create another row of labels with the values that
> compute? For some reason
> ax.get_xmajorticklabels()[0].get_text() returns ''
>
> Thanks much,
>
> Brian

Brian,

Tick labels can have multiple lines, so you don't need extra axes.  If 
you don't mind setting the tick locations yourself, then you can do this:

plot([1,2,3])
ax = gca()
ax.set_xticks([0,1,2])
ax.set_xticklabels(['abc\nABC', 'def\nDEF\n123', 'qrz'])
draw() # or show() if you are not in interactive mode

If you need to have the ticks auto-generated using a Locator, then you 
can write a custom Formatter that does the calculations and generates 
the multi-line labels.

Eric

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