Re: [Matplotlib-users] Twiny and affine transform for xlim

[magnus_p <ma...@sn...>]

I finally solved it my self, after half a day of headbanging. This did the
trick for me, it is really good since it uses the values of the lower x
axis, so you do not have to go in fiddle with ticklabels etc, it also
changes values when you pan/zoom etc.

fig = pl.figure(1,figsize=(10.5,8))
fig.clf()
ax_kms = fig.add_subplot(111)
ax_kms.step(velocity, spect)

ax_hz = ax_kms.twiny()
x_1, x_2 = ax_kms.get_xlim()

ax_hz.set_xlim(calc_frequency(x_1,data.restfreq/1e9),
calc_frequency(x_2,data.restfreq/1e9))

Great!
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