Re: [Matplotlib-users] 2 x-axes

[Neal B. <ndb...@gm...>]

Neal Becker wrote:

> Actually, though, I didn't want to plot 2 different sets of data as in that
> example, I want 1 set of data plotted with 2 different x-axis (different
> units). Any suggestion on modifying this example to accomplish this?
> 
> import numpy as np
> import matplotlib.pyplot as plt
> from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
> 
> fig = plt.figure(figsize=(10,8))
> host = SubplotHost(fig, 111)
> fig.add_subplot(host)
> parx = host.twiny()
> 
> parx.axis["top"].set_visible(False)
> offset = 0, -50
> new_axisline = parx.get_grid_helper().new_fixed_axis
> parx.axis["bottom"] = new_axisline(loc="bottom", axes=parx, offset=offset)
> parx.axis["bottom"].label.set_visible(True)
> 
> hplt, = host.plot(np.random.rand(100))
> p2, = parx.plot(np.linspace(0,20,100), np.random.rand(100)*5.0,
> color='green')
> 
> plt.show()
> 
OK, answer my own question.  Just remove the line 'parx.plot(...').  I didn't 
realize that I'd get the second axis drawn without that plot call, but it works 
fine.