Re: [Matplotlib-users] 2 x-axes

[Gökhan S. <gok...@gm...>]

Hi,

The code below should create a properly placed 2nd x-axis. You might need to
adjust the placement of the figure canvas to match into the window.

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()


There is also another example at:
http://matplotlib.sourceforge.net/mpl_toolkits/axes_grid/users/overview.html#axisartist-with-parasiteaxes

Hope this helps.

On Fri, Sep 9, 2011 at 12:50 PM, Neal Becker <ndb...@gm...> wrote:

> Neal Becker wrote:
>
> > I have a semilog plot.  I'd like to add a second x axis (maybe below the
> > existing one, or else maybe on top of graph).  This second x axis is
> simply
> > describing the same existing data, in different units.
> >
> > For example imagine a plot of
> >
> > x - time in seconds
> > y - velocity
> >
> > x2 - time in minutes
> >
> >
>
> This almost works:
>    fig = plt.figure()
>    ax = fig.add_subplot(111)
> ...
>    ax2 = ax.twiny()
>    min_x, max_x = ax.get_xlim()
>    ax2.set_xlim (min_x-1, max_x-1)
>
> except the 2nd x axis is on the top, and prints right on top of the title
>
>
>
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-- 
Gökhan