On Thu, Sep 23, 2010 at 8:52 AM, Oz Nahum <[email protected]> wrote:
> Hi Ryan,
>
> Thanks for your answer. However, I don't understand from the existing
> documentation how to use tickers.
>
> In the past I used the following method:
> class SciFormatter(Formatter):
> def __call__(self, x, pos=None):
> return "%1.1e" % x
>
>
> axs.yaxis.set_major_formatter(SciFormatter())
>
> This still does not allow me to get read of the zeros that matplotlib
> coherces .
>
> I would like to manipulate the strings of the tick labels directly. I know
> it's not ideal, but I it should work.
>
> If I could access the label "1.1E+01", I could tell python just to take
> label[:-2] and glue it to label[-1], which will give me
> "1.1E+1"
>
> I would be greatful if someone showed me how to access that string.
Why not just format the number yourself?
import matplotlib.pyplot as plt
import numpy as np
def format(x, pos=None):
if x == 0.0:
exp = 0
else:
exp = int(np.log10(np.abs(x)))
mant = x / 10**exp
return '%.2fE%+d' % (mant, exp)
f = plt.figure()
ax = f.add_subplot(111)
data = np.array([1,2,3,4,5]) / 100.
ax.plot(data, np.arange(len(data)))
ax.xaxis.set_major_formatter(plt.FuncFormatter(format))
plt.show()
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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