科学的刻度标签表示法调整 [英] Scientific tick label notation tuning

问题描述

我对刻度标签的默认科学格式并不完全满意.例如，

I am not completely satisfied with the default scientific formatting for the tick labels. For example,

import numpy as np
import pylab

pylab.rcParams['text.usetex'] = True
pylab.ticklabel_format(style='sci')

pylab.figure(1)
pylab.clf()
pylab.scatter(range(10),np.linspace(-21.305,-21.300,10))
pylab.show()

提供一张带有刻度标签

这里的问题是首先我认为-2.1298x10^1应该是-21.298，通常我只希望看到仅被3(10^3，10^6等除的指数，对于10^0我想像-21.298一样将其隐藏.)

What's wrong in here is firstly that -2.1298x10^1 should be in my opinion -21.298, and in general I would only like to see only exponents divisible with 3 (10^3, 10^6 etc and in the case of 10^0 i would like to hide it as in -21.298).

此外，我想用0和-2代替0.000和-0.002，以便将指数10^-3包括在-21.298中，以便总的滴答标签会

Also, I would like to have instead of 0.000 and -0.002 and so on 0 and -2 so that the exponent 10^-3 is included to the -21.298 so that in total the ticklabels would be

   x 10^-3 - 21.298
 0
-2
-4
-6

现在，我是否错过了一些简单的方法来做到这一点?预先谢谢你.

Now, have I missed some easy way to do this? Thank you in advance.

推荐答案

您可以使用

You can achieve it using the ScalarFormatter:

from matplotlib.ticker import ScalarFormatter

sf = ScalarFormatter()
sf.set_scientific(True)
sf.set_powerlimits((-0.00001, 0.00001))

ax = pylab.gca()
ax.yaxis.set_major_formatter(sf)
pylab.show()

您可以通过将数字传递给format_data()来测试格式化程序将如何处理给定数字:

You can test what the formatter will do to a given number by passing the number to format_data():

sf.format_data(0.002)
#'2{\\times}10^{-3}'

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