```pythonimport numpy as npimport matplotlib.pyplot as pltimport os #导入os库x=np.linspace(0, 10, 30)#产生0-10之间30个元素的等差数列noise=np.random.randn(30)#产生30个标准正态分布的元素y1=x**2+2*noise #//产生叠加噪声的数据系列1y2=x**1+2*noise #产生叠加噪声的数据系列2y3=x**1.5+2*noise #产生叠加噪声的数据系列3\n"plt.rcParams['font.sans-serif'] = 'SimHei'#设置字体为SimHei显示中文\n",plt.rc('font', size=14)#设置图中字号大小\n",plt.figure(figsize=(6,4))#绘制折线图，设置颜色和线型\n",plt.plot(x,y1,color = 'r',linestyle = '--')plt.plot(x,y2,color = 'b',linestyle = '-')plt.plot(x,y3,color = 'b',linestyle = '-.')plt.title('折线图')#添加标题\n",plt.legend(['曲线y1','曲线y2','曲线y3'])#添加图例\n",plt.xlabel('x')#添加横轴标签\n",plt.ylabel('y')#添加纵轴标签\n",path='D:\\my_python\\ch3\\output\\'if not os.path.exists(path):os.makedirs(path)plt.savefig(path+'scatter.jpg')#保存图片plt.savefig(path+'plot.jpg')#保存图片\n",plt.show()
