我有一个带对数x轴和y轴的散点图(因为我主要对沿两者的较低值感兴趣)。
但是,我希望刻度标签为十进制格式,而不是10 ^ x。
我用这个:
# axis limits:
ax.set_xlim(xmin=0, xmax = 1.2)
ax.set_ylim(ymin=0,ymax=1000)
# log scales:
ax.set_yscale('log')
ax.set_xscale('log')
# set y-ticks:
ax.set_yticks((1,10,100,1000))
ax.set_yticklabels(("1","10","100","1000"))
这有效(虽然介绍ax.set_yscale('log')
或ax.set_xscale('log')
会发出以下警告(任何想法是什么?):
Warning (from warnings module):
File "C:\Python27\lib\site-packages\numpy\ma\core.py", line 3785
warnings.warn("Warning: converting a masked element to nan.")
UserWarning: Warning: converting a masked element to nan.
但是当我为x轴尝试相同的时候,我得到一个MaskError:
# set x-ticks:
ax.set_xticks((0, 0.2, 0.4, 0.8, 1))
ax.set_xticklabels(("0", "0.2", "0.4", "0.8", "1"))
[snip long long traceback]
File "C:\Python27\lib\site-packages\numpy\ma\core.py", line 3795, in __int__
raise MaskError, 'Cannot convert masked element to a Python int.'
MaskError: Cannot convert masked element to a Python int.
我认为这与次要与主要蜱有关。我试图玩自动收报机,但最后总是遇到同样的错误。
我非常感谢任何帮助!
回答后编辑: 通过替换
解决了问题ax.set_yticks((1,10,100,1000))
ax.set_yticklabels(("1","10","100","1000"))
ax.set_xticks((0, 0.2, 0.4, 0.8, 1))
ax.set_xticklabels(("0", "0.2", "0.4", "0.8", "1"))
与
ax.yaxis.set_major_formatter(FormatStrFormatter('%1.0f'))
ax.xaxis.set_major_formatter(FormatStrFormatter('%.1f'))
ax.xaxis.set_minor_formatter(FormatStrFormatter('%.1f'))
答案 0 :(得分:8)
您可以将ticker
用作:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.ticker import FormatStrFormatter
fig = plt.figure(1, [5,4])
ax = fig.add_subplot(111)
ax.plot( range(1,100) , range(1,100) , color='#aaaaff')
ax.set_xscale('log')
ax.xaxis.set_major_formatter(FormatStrFormatter('%.03f'))
plt.show()