Re: [Matplotlib-users] Two questions...

[Jae-Joon L. <lee...@gm...>]

The example below will give you some idea where to start.
It uses twin function in axes_grid toolkit.
(also see http://matplotlib.sourceforge.net/examples/axes_grid/parasite_simple2.html)

You may use twinx or twiny, but you need to make both x and y axis in
sync to each other (maybe using the "xlim_changed" or "ylim_changed"
event).

To change the title position you set_position method (the coordinate
is in normalized axes coordinate). If you need more control, I
recommend to use annotate function.

Regards,

-JJ

import matplotlib.transforms as mtransforms
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid.parasite_axes import SubplotHost

fig = plt.figure()

ax1 = SubplotHost(fig, 1,1,1)
fig.add_subplot(ax1)

ax1.plot([41000, 42000, 43000], [10., 60, 80.])

y_max = 90

aux_trans = mtransforms.Affine2D().scale(3600., y_max) # transform
from ax2 to ax1

ax2 = ax1.twin(aux_trans)

from matplotlib.dates import DateFormatter, HourLocator
locator    = HourLocator()
ax2.xaxis.set_major_locator(locator)
formatter = DateFormatter(r'$%H^h$')
ax2.xaxis.set_major_formatter(formatter)

t = ax1.set_title("Title")
t.set_position((0.5, 1.05))

plt.show()