Python numpy.tril()
numpy.tril(a, k=0):返回带有三角形下半部分的数组副本w.r.tk
参数 :
a : 输入数组
k : [int, optional, 0 by default] 。
我们需要的对角线;k>0意味着对角线高于主对角线,反之亦然。
返回值 :
a的下三角,具有与a相同的形状和数据类型。
# Python Programming illustrating
# numpy.tril method
import numpy as geek
# string input
a = geek.matrix([[1, 21, 30],
[63 ,434, 3],
[54, 54, 56]])
print("Main Diagonal elements : \n", geek.tril(a), "\n")
print("Diagonal above main Diagonal elements : \n", geek.tril(a, 1), "\n\n")
print("Main Diagonal elements : \n", geek.tril(a, -1))
输出 :
Main Diagonal elements :
[[ 1 0 0]
[ 63 434 0]
[ 54 54 56]]
Diagonal above main Diagonal elements :
[[ 1 21 0]
[ 63 434 3]
[ 54 54 56]]
Main Diagonal elements :
[[ 0 0 0]
[63 0 0]
[54 54 0]]