# import numpy as np # import matplotlib.pyplot as plt # # x = np.linspace(-1, 1, 50) # y1 = 2 * x + 1 # # # figure 1 # plt.figure() # plt.plot(x, y1) # # # # figure 2 # y2 = x**2 # plt.figure() # plt.plot(x, y2) # # # # figure 3，指定figure的编号并指定figure的大小, 指定线的颜色, 宽度和类型 # y2 = x**2 # plt.figure(num = 5, figsize = (4, 4)) # plt.plot(x, y1) # plt.plot(x, y2, color = 'red', linewidth = 1.0, linestyle = '--') # plt.show() import matplotlib.pyplot as plt import numpy as np x = np.linspace(-3,3,50)#从-3到3设置50个点 #设置两个函数 y1 = 2 * x + 1 y2 = x ** 2 plt.figure() plt.plot(x,y1)#传入函数的变量和结果 # plt.figure()#两个figure都没有传值，则进行默认排序 # plt.plot(x,y2) # plt.figure(num=4)#此时穿进去参数改变figure的序号 # plt.plot(x,y2) # plt.figure(num=3,figsize=(2,3))#设置图像的长宽 # plt.plot(x,y2) plt.figure(num=3,figsize=(8,5))#设置图像的长宽 plt.plot(x,y2) plt.plot(x,y1,color = 'red',linewidth = 1.0,linestyle = '--')#设置线的宽度和显示风格 plt.show()