Re: [Matplotlib-users] Getting tight layout to recognize the second axis via twinx()

[Eric F. <ef...@ha...>]

On 2012/08/28 9:11 PM, Jeffrey Spencer wrote:
> For example running this code and then fig.tight_layout(). The second
> axis isn't recognized. Is there a way to add it to the tight_layout spec
> or a better method.

This is a bug, or rather one of the ways in which tight_layout is 
limited. twinx and twiny probably will need to return SubplotBase 
instances if their parent is a SubplotBase instance.  I don't 
immediately see a quick and easy way to do this. I filed a ticket:
https://github.com/matplotlib/matplotlib/issues/1165

Eric

>
> out = ones(200)
> fign = 52
> h, w = freqz(out)
> fig = figure(fign)
> semilogy(h,abs(w)/abs(max(w)), 'b', label='Mag')
> ylim(0.01,1.2)
> ylabel('Amplitude (db)', color='b')
> xlabel('Frequency (rad/sample)')
> ax = fig.gca()
> ax2 = ax.twinx()
> angles = unwrap(angle(w))
> plot(h, angles, 'g')
> ylabel('Phase (rads)', color='g')
>
> Cheers,
> Jeff
>
>
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