机器学习实战----regTree,遇到的坑，python3.5.2

代码：

def binSplitDataSet(dataSet, feature,value):#数据集合，待切分的特征，特征值，将数据集合切分得到两个子集
    mat0 = dataSet[nonzero(dataSet[:,feature] > value)[0], :][0]
    mat1 = dataSet[nonzero(dataSet[:,feature] <= value)[0], :][0]
    return mat0, mat1

报错：

  File "D:/AI/set_test.py", line 19, in binSplitDataSet
    mat0 = dataSet[nonzero(dataSet[:,feature] > value)[0], :][0]
  File "D:\python3.5.2\install\lib\site-packages\numpy\matrixlib\defmatrix.py", line 284, in __getitem__
    out = N.ndarray.__getitem__(self, index)
IndexError: index 0 is out of bounds for axis 0 with size 0

根据作者提供的测试数据ex00进行运行代码，运行到第41行数据，发现

dataSet[:,feature] > value，结果全部为false,所以

nonzero(dataSet[:,feature] > value)为[],因此

nonzero(dataSet[:,feature] > value)[0]报错

index 0 is out of bounds for axis 0 with size 0