numpy.delete删除一列或多列的方法

时间:2022-11-30 08:26:31

基础介绍:

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numpy.delete
numpy.delete(arr, obj, axis=None)[source]
 Return a new array with sub-arrays along an axis deleted. For a one dimensional array, this returns those entries not returned by arr[obj].
 Parameters:   
 arr : array_like
  Input array.
 obj : slice, int or array of ints
  Indicate which sub-arrays to remove.
 axis : int, optional
  The axis along which to delete the subarray defined by obj. If axis is None, obj is applied to the flattened array.
 Returns:  
 out : ndarray
  A copy of arr with the elements specified by obj removed. Note that delete does not occur in-place. If axis is None, out is a flattened array.

示例:

1.删除一列

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>>> dataset=[[1,2,3],[2,3,4],[4,5,6]]
>>> import numpy as np
>>> dataset = np.delete(dataset, -1, axis=1)
>>> dataset
array([[1, 2],
  [2, 3],
  [4, 5]])

2.删除多列

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arr = np.array([[1,2,3,4], [5,6,7,8], [9,10,11,12]])
np.delete(arr, [1,2], axis=1)
array([[ 1, 4],
  [ 5, 8],
  [ 9, 12]])

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原文链接:https://blog.csdn.net/sinat_27693393/article/details/73195570