[Matplotlib-users] double tick labels (bottom and top, but with different labels)

Pierre Haessig pierre.haessig at crans.org
Wed Apr 25 08:34:47 EDT 2018


I'd like to know if it's possible to get a sort of double tick labeling
(e.g. bottom and top), but with different labels. One way to think of my
use case is that there are two different units for the x data (or more
precisely in my case, I've two different x quantities which are bound by
a linear relationship).

The result I'd like is the right part of the attached image (it's a
Gimp-edited mockup composition of the two actual plots on the left).

I've tried to play with the double labeling of a single axe. Indeed, the
following two calls put the double labeling


However, when I want to alter only the top labels using

    for tick, l in zip(ax1.xaxis.get_major_ticks(), l2):

I get no visible change on the plot. (full script attached). Did I need
to call some update ?

Did I miss something with the proper way to call Tick.set_label2?

Looking at the source code of ax1.xaxis.set_ticklabels, there is
something I don't get. First it sets a FixedFormatter(ticklabels), and
then it sets label1 and/or label2 for each Tick object. So in the end,
where is the text coming from?

Also, to complement the second series of tick labels, I'd like a second
axis label as well. However, I only know
ax.xaxis.set_label_position('top') to move xlabel to the top, not to get
a 2nd one...

As an alternative approach, I see twinx. I didn't try it yet, because I
feel like my objective is not of the objective of twinx (e.g. I'm
plotting only a single dataset, not two). However, I suspect it's
possible to 'bend" twinx to get what I want. What do you think.

Thank you in advance for your ideas.



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