On Wed, Mar 24, 2010 at 8:03 PM, Angus McMorland amcm...@gmail.com wrote:
On 24 March 2010 17:33, Nils Wagner nwag...@iam.uni-stuttgart.de wrote:
Hi all,
how can I change the output format of yticks from 100
to 1.e6 ?
I'm not sure if there's an easier way still, but this works:
from matplotlib.ticker import Formatter
class SciFormatter(Formatter):
def __call__(self, x, pos=None):
return %0.2e % x
ax = plt.gca()
ax.yaxis.set_major_formatter(SciFormatter())
plt.draw()
There's an easier way to format based on a string:
import matplotlib.pyplot as plt
#Also available in matplotlib.ticker namespace
sci_formatter = plt.FormatStrFormatter('%0.2e')
plt.gca().yaxis.set_major_formatter(sci_formatter)
plt.draw()
You can also make the default formatter (ScalarFormatter) display
scientific notation for smaller numbers (the default is anything with
an abs() = 1e7). This displays in a slightly different way, with the
base power off to the side of the axis:
form = plt.gca().yaxis.get_major_formatter()
# so anything with abs() = 1 will display in scientific notation
form.set_powerlimits((-4, 4))
plt.draw()
Ryan
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Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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