Hi again,
unfortunately, the proposed solution breaks a second y-axis. Attached
is a script which demonstrates the problem in the third figure. The
second axis should be half of the first one.
import pylab
import scipy
pylab.close('all')
##------------------------------------------------------------------------------
## matplotlib.pyplot / pylab
x = scipy.arange(100)
y = scipy.rand(100) + 1000006
pylab.figure()
pylab.plot(x,y)
pylab.grid()
#pylab.ticklabel_format(useOffset=1000000, axis='y')
pylab.ticklabel_format(useOffset=False, axis='y')
##------------------------------------------------------------------------------
## matplotlib
fig = pylab.figure(figsize=(8,6))
ax = fig.add_subplot(111)
ax.plot(x,y)
ax.grid()
ax.ticklabel_format(useOffset=1000000, axis='y')
#ax.ticklabel_format(useOffset=False, axis='y')
##------------------------------------------------------------------------------
## matplotlib twinx()
fig = pylab.figure(figsize=(8,6))
ax1 = fig.add_subplot(111)
ax2 = ax1.twinx()
ax1.plot(x,y)
ax1.grid()
## automatically update ylim of ax2 when ylim of ax1 changes:
def update_ax2(ax1):
y1, y2 = ax1.get_ylim()
## modify the limits
ax2.set_ylim((y1/2., y2/2.))
ax2.figure.canvas.draw()
ax1.callbacks.connect("ylim_changed", update_ax2)
ax1.ticklabel_format(useOffset=False, axis='y')
##------------------------------------------------------------------------------
pylab.show()
2011/3/10 Daniel Mader <danielstefanma...@googlemail.com>:
> Hi Ben,
>
> thanks a lot, this really helpes in the simple example, I'll try to
> find out how to use it in the complex script. It seems 1.0.0 is recent
> enough for this!
>
> Thanks again,
> Daniel
>
> 2011/3/10 Benjamin Root <ben.r...@ou.edu>:
>>
>>
>> On Thu, Mar 10, 2011 at 4:54 AM, Daniel Mader
>> <danielstefanma...@googlemail.com> wrote:
>>>
>>> Hi,
>>>
>>> is it possible to change the default y-axis scaling so that the
>>> ticks/label are not with respect to the large offset?
>>>
>>> For example:
>>>
>>> import scipy
>>> import pylab
>>>
>>> x = scipy.arange(100)
>>> y = scipy.rand(100) + 1000006
>>>
>>> pylab.figure()
>>> pylab.plot(x,y)
>>> pylab.grid()
>>>
>>> pylab.show()
>>>
>>> This gives the y-limits as (0,1) with respect to 1000006. This makes
>>> it very hard to read. I'd like to be able to configure this manually.
>>>
>>> Thanks in advance,
>>> Daniel
>>>
>>
>> I tried to fix matplotlib to be smarter about choosing the offset value a
>> while back, but I couldn't come up with something that worked well in the
>> general case. You can manually turn it off completely, and have the full
>> value displayed (or even manually set the offset value). If you have a very
>> recent matplotlib:
>>
>> import matplotlib.pyplot as plt
>> import numpy as np
>>
>> x = np.arange(100)
>> y = np.random.rand(100) + 1000006
>>
>> plt.figure()
>> plt.plot(x, y)
>> plt.grid()
>> plt.ticklabel_format(useOffset=1000000, axis='y')
>>
>> plt.show()
>>
>> Or you can turn it off by setting useOffset to False.
>>
>> If you don't have a recent enough matplotlib, you can turn it off completely
>> by doing something like this:
>>
>> import matplotlib.pyplot as plt
>> import numpy as np
>> from matplotlib.ticker import ScalarFormatter
>>
>> x = np.arange(100)
>> y = np.random.rand(100) + 1000006
>>
>> fig = plt.figure()
>> ax = fig.gca()
>> ax.plot(x, y)
>> ax.grid()
>> ax.yaxis.set_major_formatter(ScalarFormatter(useOffset=False))
>>
>> plt.show()
>>
>>
>> I hope this helps!
>> Ben Root
>>
>>
>
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