Jae-Joon Lee wrote:
> Use pylab's yticks command.
>
> http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.yticks
>
> Or Axes.set_yticklabels together with Axes.set_yticks.
>
> http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.set_yticklabels
>
> -JJ
Or a make a very simple custom Formatter:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.ticker import ScalarFormatter
class PositiveFormatter(ScalarFormatter):
def pprint_val(self, x):
return ScalarFormatter.pprint_val(self, np.abs(x))
x = np.arange(0,20,0.1)
y = 100 * np.sin(x)
plt.plot(x, y)
ax = plt.gca()
ax.yaxis.set_major_formatter(PositiveFormatter())
plt.show()
This is a much safer way to handle it than trying to modify tick labels
directly.
Eric
>
>
> On Fri, Jul 31, 2009 at 4:07 PM, Lukas Hetzenecker<l...@gmx.at> wrote:
>> Hello,
>>
>> I have y values in the range of -100 to 100.
>> I want that the negative values are shown as positive (the minus gets removed
>> from the output).
>>
>> I tried a for loop over all self.ax.get_yticklabels() and call
>> label.set_text("...") on each item but it didn't work - nothing got changed.
>>
>> If I print the label in the loop they seem to be empty:
>> Text(0,0,'')
>> Text(0,0,'')
>> Text(0,0,'')
>> ......
>>
>> Is there anything I do wrong?
>>
>> Thanks,
>> Lukas
>>
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