使用python切片实现二维数组复制示例

1.1,1.5,2.5 
1.3,1.9,3.2 
1.5,2.3,3.9 
1.7,2.7,4.6 
1.9,3.1,5.3 
2.1,3.5,6 
2.3,3.9,6.7 
2.5,4.3,7.4 
2.7,4.7,8.1 
2.9,5.1,8.8 

m, n = np.shape(dataSet)
trainData = np.ones((m, n))
trainData[:8,:-1] = dataSet[:8,:-1]

[[ 1.1 1.5 1. ] 
[ 1.3 1.9 1. ] 
[ 1.5 2.3 1. ] 
[ 1.7 2.7 1. ] 
[ 1.9 3.1 1. ] 
[ 2.1 3.5 1. ] 
[ 2.3 3.9 1. ] 
[ 2.5 4.3 1. ] 
[ 1. 1. 1. ] 
[ 1. 1. 1. ]]