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Author: wzy6642

CART_Project2/CART.py

@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -*-
+"""
+Created on Wed Aug  1 20:55:39 2018
+
+@author: wzy
+"""
+import matplotlib.pyplot as plt
+import numpy as np
+
+"""
+函数说明：加载数据
+
+Parameters:
+    fileName - 文件名
+    
+Returns:
+    dataMat - 数据矩阵
+
+Modify:
+    2018-08-01
+"""
+def loadDataSet(fileName):
+    dataMat = []
+    fr = open(fileName)
+    for line in fr.readlines():
+        curLine = line.strip().split('\t')
+        # 转换为float类型
+        # map()是 Python 内置的高阶函数，它接收一个函数 f 和一个 list，并通过把函数 f 依次作用在 list 的每个元素上，得到一个新的 list 并返回。
+        fltLine = list(map(float, curLine))
+        dataMat.append(fltLine)
+    return dataMat
+
+
+"""
+函数说明：绘制数据集
+
+Parameters:
+    fileName - 文件名
+    
+Returns:
+    None
+
+Modify:
+    2018-08-01
+"""
+def plotDataSet(filename):
+    dataMat = loadDataSet(filename)
+    n = len(dataMat)
+    xcord = []
+    ycord = []
+    # 样本点
+    for i in range(n):
+        xcord.append(dataMat[i][1])
+        ycord.append(dataMat[i][2])
+    fig = plt.figure()
+    ax = fig.add_subplot(111)
+    # 绘制样本点
+    ax.scatter(xcord, ycord, s=20, c='blue', alpha=.5)
+    plt.title('DataSet')
+    plt.xlabel('X')
+    plt.show()
+    
+    
+if __name__ == '__main__':
+    filename = 'ex0.txt'
+    plotDataSet(filename)

CART_Project2/ex0.txt

@@ -0,0 +1,200 @@
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