在python中绘制多行
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Plotting multiple lines in python
提问by user46543
I am new in Python and I want to plot multiple lines in one graph like in the figure below.
我是 Python 新手，我想在一张图中绘制多条线，如下图所示。
I have tried write simple plotting code like this:
我曾尝试编写这样的简单绘图代码：
I know these parameters
我知道这些参数
# red dashes, blue squares and green triangles
plt.plot(t, t, 'r--', t, t**2, 'bs', t, t**3, 'g^')
But I have a lot of lines such in the first figure, what kind of parameters which I can use to plotting like the first figure.
但是我在第一个图中有很多行，我可以使用什么样的参数来像第一个图一样绘图。
Thank you
谢谢
回答by alexblae
There are many options for line styles and marker in MPL. Have a look here, hereand here.
MPL 中的线条样式和标记有很多选项。看看这里，这里和这里。
For your specific example (I quickly made up some functions and roughly plotted the first few examples):
对于您的具体示例（我快速编写了一些函数并粗略地绘制了前几个示例）：
import matplotlib.pyplot as plt
import numpy as np
x=np.arange(6)
fig=plt.figure()
fig.show()
ax=fig.add_subplot(111)
ax.plot(x,x,c='b',marker="^",ls='--',label='GNE',fillstyle='none')
ax.plot(x,x+1,c='g',marker=(8,2,0),ls='--',label='MMR')
ax.plot(x,(x+1)**2,c='k',ls='-',label='Rand')
ax.plot(x,(x-1)**2,c='r',marker="v",ls='-',label='GMC')
ax.plot(x,x**2-1,c='m',marker="o",ls='--',label='BSwap',fillstyle='none')
ax.plot(x,x-1,c='k',marker="+",ls=':',label='MSD')
plt.legend(loc=2)
plt.draw()
This should give you something like this.
这应该给你这样的东西。
回答by Xero Smith
You can define a figure first, then define each plot separately. Below is a minimal example
. You can find more detailed examples here(just focus on the plots).
您可以先定义一个图形，然后分别定义每个图。下面是一个最小的例子。你可以在这里找到更详细的例子（只关注情节）。
import numpy as np
import matplotlib.pyplot as plt
t = np.linspace(1, 10, 1000)
plt.figure(figsize=(10, 6))
line1, = plt.plot(t, np.sin(t * 2 * np.pi), 'b-', label='$sin(t)$')
line2, = plt.plot(t, np.cos(t * 2 * np.pi/2), 'r--', label='$sin(t)$')
line3, = plt.plot(t, (np.sin(t * 2 * np.pi))**2, 'k.-', label='$sin(t)$')
plt.legend(loc='upper right')
