Here is the modified version of your code that works for me.
1) If you change trans_aux, you also need to plot your data in an
appropriate coordinate. Your original code did not work because you
scaled the xaxis of the second axes (par) but you were still plotting
the original data, i.e., "time" need to be scaled if you want to plot
it on "par". The code below takes slightly different approach.
2) I fount that I was wrong with the factor of 3600. It needs to be
86400, i.e., a day in seconds. Also, The unit must be larger than 1.
Again, please take a look how datetime unit works.
Regards,
-JJ
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.transforms as mtransforms
from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
# Prepare some random data and time for seconds-from-midnight (sfm)
representation
ydata1 = np.random.random(100) * 1000
ydata2 = np.ones(100) / 2.
time = np.arange(3550, 3650)
fig = plt.figure()
host = SubplotHost(fig, 111)
fig.add_subplot(host)
# This is the heart of the example. We have to scale the axes correctly.
aux_trans = mtransforms.Affine2D().translate(0., 0.).scale(3600, ydata1.max())
par = host.twin(aux_trans)
host.set_xlabel("Time [sfm]")
host.set_ylabel("Random Data 1")
par.set_ylabel("Random Data 2")
par.axis["right"].label.set_visible(True)
p1, = host.plot(time, ydata1)
p2, = par.plot(time, ydata2)
host.axis["left"].label.set_color(p1.get_color())
par.axis["right"].label.set_color(p2.get_color())
host.axis["bottom"].label.set_size(16)
host.axis["left"].label.set_size(16)
par.axis["right"].label.set_size(16)
# Move the title little upwards so it won't overlap with the ticklabels
title = plt.title("Double time: SFM and HH:MM:SS", fontsize=18)
title.set_position((0.5, 1.05))
plt.show()
On Sun, Sep 27, 2009 at 12:32 PM, Gökhan Sever <gokhanse...@gmail.com> wrote:
> Hello,
>
> As was suggested by Jae-Joon, I have simplified the code for easier
> investigation and run. The aim of the script is to have time represented on
> both bottom and top x-axes, on the bottom in seconds-from-midnight (SFM),
> and the top should show as HH:MM:SS, while there is two different data
> source being used for y-axes. The code could be seen here or from
> http://code.google.com/p/ccnworks/source/browse/trunk/double_time.py
>
> Currently something wrong with the scaling, since the right y-axis data is
> missing on the plotting area. Also, sfm hasn't been converted to HH:MM:SS.
> adding this: par.xaxis.set_major_formatter(DateFormatter('%H:%M:%S'))
> doesn't remedy the situation as of yet.
>
> All comments are welcome.
>
> ### BEGIN CODE ###
> #!/usr/bin/env python
>
> """
>
> Double time representation. Bottom x-axis shows time in
> seconds-from-midnight
> (sfm) fashion, whereas the top x-axis uses HH:MM:SS representation.
>
> Initially written by Gokhan Sever with helps from Jae-Joon Lee.
>
> Written: 2009-09-27
>
> """
>
> import numpy as np
> import matplotlib.pyplot as plt
> import matplotlib.transforms as mtransforms
> from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
>
>
> # Prepare some random data and time for seconds-from-midnight (sfm)
> representation
> ydata1 = np.random.random(100) * 1000
> ydata2 = np.ones(100) / 2.
> time = np.arange(3550, 3650)
>
>
> fig = plt.figure()
> host = SubplotHost(fig, 111)
> fig.add_subplot(host)
>
> # This is the heart of the example. We have to scale the axes correctly.
> aux_trans = mtransforms.Affine2D().translate(0., 0.).scale(3600,
> ydata1.max())
> par = host.twin(aux_trans)
>
> host.set_xlabel("Time [sfm]")
> host.set_ylabel("Random Data 1")
> par.set_ylabel("Random Data 2")
> par.axis["right"].label.set_visible(True)
>
> p1, = host.plot(time, ydata1)
> p2, = par.plot(time, ydata2)
>
> host.axis["left"].label.set_color(p1.get_color())
> par.axis["right"].label.set_color(p2.get_color())
>
> host.axis["bottom"].label.set_size(16)
> host.axis["left"].label.set_size(16)
> par.axis["right"].label.set_size(16)
>
> # Move the title little upwards so it won't overlap with the ticklabels
> title = plt.title("Double time: SFM and HH:MM:SS", fontsize=18)
> title.set_position((0.5, 1.05))
>
> plt.show()
> ### END CODE ###
>
>
> --
> Gökhan
>
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