Python 使用 matplotlib 时设置 xlim 和 ylim（奇怪的东西）
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setting xlim and ylim while using matplotlib (something strange)
提问by Krishnan
# the first plot DOES NOT set the xlim and ylim properly
import numpy as np
import pylab as p
x = np.linspace(0.0,5.0,20)
slope = 1.0
intercept = 3.0
y = slope*x + intercept
p.set_xlim = ([0.0,10.0])
p.set_ylim = ([0.0,10.0])
p.plot(x,y)
p.show()
p.clf()
def xyplot():
slope = 1.0
intercept = 3.0
x = np.linspace(0.0,5.0,20)
y = slope*x + intercept
p.xlim([0.0,10.0])
p.ylim([0.0,10.0])
p.plot(x,y)
p.show()
# if I place the same exact code a a function, the xlim and ylim
# do what I want ...
xyplot()
回答by tbekolay
You are setting set_xlimand set_yliminstead of calling it. Where you have:
您正在设置set_xlim而set_ylim不是调用它。你有：
p.set_xlim = ([0.0,10.0])
p.set_ylim = ([0.0,10.0])
you should have:
你应该有：
p.set_xlim([0.0,10.0])
p.set_ylim([0.0,10.0])
When you make that change, you'll notice that set_xlimand set_ylimcan't be called because they don't exist in the pylabnamespace. pylab.xlimis a shortcut that gets the current axes object and calls that object's set_xlimmethod. You could do this yourself with:
当你做出的改变，你会发现，set_xlim并set_ylim不能说是因为它们没有在存在pylab命名空间。pylab.xlim是获取当前坐标区对象并调用该对象set_xlim方法的快捷方式。你可以自己做：
ax = p.subplot(111)
ax.set_xlim([0.0,10.0])
ax.set_ylim([0.0,10.0])
