secondary y-axis

If it helps clarify what I mean, attached is a plot I made in excel (I
really don't want to use excel). The y-xis on the left goes from -60 to
80. The one on the right goes from 0-1.

Ryan

Ryan Krauss wrote:

secondary_axis.jpg

···

Is it possible to overlay two plots with different y-axis limit? I think excel calls this plotting a data set with a secondary y-axis. I want to overlay a bode plot with its coherence and the y-axis limits for the two will be very different. I don't want to plot one above the other with a subplot, but actually overlay them on the same plot.
(and I want to do it on a semilogx).

Thanks,

Ryan

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It appears that this feature is available through the twinx() function according to:

http://matplotlib.sourceforge.net/faq.html#TWOSCALES
(the link on this page is broken, but I have the file in some examples I downloaded from somewhere else on the matplotlib page.)

I created the second plot using:
figure(1)
subplot(211)
ax2=pylab.twinx()
pylab.semilogx(freq,iobode.coh,'k')

It seems like once I called the twinx function, the x-axis settings that where on the original axis are ignored and I can't seem to change the axis settings. pylab.axes([0.1,30,0,1]) returned an error: RuntimeError: Transformation is not invertible

I tried calling the ax2.set_xlim((0.1,30)) function but it doesn't seem to do anything.

Ryan

Ryan Krauss wrote:

···

If it helps clarify what I mean, attached is a plot I made in excel (I
really don't want to use excel). The y-xis on the left goes from -60 to
80. The one on the right goes from 0-1.

Ryan

Ryan Krauss wrote:

Is it possible to overlay two plots with different y-axis limit? I think excel calls this plotting a data set with a secondary y-axis. I want to overlay a bode plot with its coherence and the y-axis limits for the two will be very different. I don't want to plot one above the other with a subplot, but actually overlay them on the same plot.
(and I want to do it on a semilogx).

Thanks,

Ryan

-------------------------------------------------------
This SF.Net email is sponsored by:
Power Architecture Resource Center: Free content, downloads, discussions,
and more. http://solutions.newsforge.com/ibmarch.tmpl
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

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