numpy.delete 函数
此函数返回一个新数组,其中指定的子数组已从输入数组中删除。 与 insert() 函数的情况一样,如果不使用轴参数,输入数组将被展平。 该函数采用以下参数 −
Numpy.delete(arr, obj, axis)
这里,
序号 | 参数 & 描述 |
---|---|
1 | arr 输入数组 |
2 | obj 可以是切片、整数或整数数组,表示要从输入数组中删除的子数组 |
3 | axis 删除给定子数组所沿的轴。 如果没有给出,arr 被展平 |
示例
import numpy as np a = np.arange(12).reshape(3,4) print 'First array:' print a print '\n' print 'Array flattened before delete operation as axis not used:' print np.delete(a,5) print '\n' print 'Column 2 deleted:' print np.delete(a,1,axis = 1) print '\n' print 'A slice containing alternate values from array deleted:' a = np.array([1,2,3,4,5,6,7,8,9,10]) print np.delete(a, np.s_[::2])
它的输出将如下所示 −
First array: [[ 0 1 2 3] [ 4 5 6 7] [ 8 9 10 11]] Array flattened before delete operation as axis not used: [ 0 1 2 3 4 6 7 8 9 10 11] Column 2 deleted: [[ 0 2 3] [ 4 6 7] [ 8 10 11]] A slice containing alternate values from array deleted: [ 2 4 6 8 10]