On Mon, Aug 11, 2008 at 1:45 PM, Jeffrey Fogel
<[EMAIL PROTECTED]> wrote:
> The two things I have been unable to figure out are how to add a major
> tick at all of the other magnitudes (those without a label) and how to
> change the format of the labels so that only the exponent is showing.
> I'm sure both of these are straightforward, but I have been unable to
> figure them out. Thanks for your help.
You can accomplish both in one swoop using a custom formatter instead
of a custom locator. That is, instead of using a
LogLocator(base=100.0) which isn't giving you ticks where you want
them, use the default log locator, and make a custom formatter to
suppress strings where you don't want them and to use the format you
want. Eg, something like
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
fig = plt.figure()
ax = fig.add_subplot(111)
N = 1000
x = np.arange(N)
y = np.random.rand(N)*1e8
ax.semilogy(x, y)
class MyFormatter(ticker.LogFormatter):
def __call__(self, val, pos=None):
fx = int(np.log(abs(val))/np.log(self._base) +0.5)
isDecade = self.is_decade(fx)
if not isDecade and self.labelOnlyBase:
return ''
if (fx%2)==1: # odd, skip
return ''
return '%d'%fx
ax.yaxis.set_major_formatter(MyFormatter())
plt.show()
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