Change the text of yticklabels

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

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

···

On Fri, Jul 31, 2009 at 4:07 PM, Lukas Hetzenecker<LuHe@...1843...> 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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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<LuHe@...1843...> 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,'')
......

Is there anything I do wrong?

Thanks,
Lukas

------------------------------------------------------------------------------
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trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
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