python绘制直方图的方法

import numpy as np
import matplotlib.pyplot as plt
import os #导入os库


x_norm1=np.random.randn(1000)
plt.rcParams['axes.unicode_minus']=False#显示负号\n",
plt.figure(figsize=(6,4))## 设置画布\n",
plt.hist(x_norm1,bins=50)
plt.show()

plt.rcParams['axes.unicode_minus']=False#显示负号\n",
plt.figure(figsize=(6,4))## 设置画布\n",
# plt.hist(x_norm1,bins=50)
x_norm2=2+np.random.randn(1000)
x_norm3=4+np.random.randn(1000)
plt.figure(figsize=(6,4))## 设置画布\n",
plt.hist(x_norm1,bins=50,density=True,color='r')
plt.hist(x_norm2,bins=50,density=True,color='g')
plt.hist(x_norm3,bins=50,density=True,color='b')


plt.show()

p = plt.figure(figsize=(12,12))\n",
    "# 子图1，点线图\n",
    "ax1 = p.add_subplot(2,2,1)#2行2列4幅子图的第1幅\n",
    "plt.plot(x,y1,color = 'r',linestyle = '--',marker = 'o')\n",
    "plt.plot(x,y2,color = 'b',linestyle = '-',marker = '*')\n",
    "plt.plot(x,y3,color = 'g',linestyle = '-',marker = '^')\n",
    "plt.title('点线图')#添加标题\n",
    "plt.legend(['曲线y1','曲线y2','曲线y3'])\n",
    "plt.xlabel('x')#添加横轴标签\n",
    "plt.ylabel('y')#添加y轴名称\n",
    "# 子图2，柱状图\n",
    "ax1 = p.add_subplot(2,2,2)#2行2列4幅子图的第2幅\n",
    "plt.bar([0,1,2],[np.sum(y1),np.sum(y2),np.sum(y3)],width = 0.5)## 绘制柱状图\n",
    "plt.title('柱状图')#添加标题\n",
    "labels=['y1的和','y2的和','y3的和']\n",
    "plt.xlabel('数据系列y')#添加横轴标签\n",
    "plt.ylabel('数据系列y的和')#添加y轴名称\n",
    "plt.xticks(range(3),labels)\n",
    "# 子图3，饼图\n",
    "ax1 = p.add_subplot(2,2,3)#2行2列4幅子图的第3幅\n",
    "plt.pie([np.sum(y1),np.sum(y2),np.sum(y3),],labels=labels,\n",
    "        autopct='%1.1f%%')#绘制饼图\n",
    "plt.title('饼图')#添加标题\n",
    "# 子图4，箱线图\n",
    "ax1 = p.add_subplot(2,2,4)#2行2列4幅子图的第4幅\n",
    "labels=['数据系列y1','数据系列y2','数据系列y3']\n",
    "plt.boxplot([y1,y2,y3],notch=True,labels = labels, meanline=True)\n",
    "plt.title('箱线图')#添加标题\n",
    "plt.xlabel('数据系列y')#添加横轴标签\n",
    "plt.ylabel('数据系列y的值')#添加y轴名称\n",
    "plt.savefig(path+'4subgraph.jpg')#保存图片\n",
    "plt.show()"