Re: [Matplotlib-users] secondary y-axis

[Ryan K. <rya...@co...>]

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
>>
>>
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