Python中的 numpy.diag()
numpy.diag(a, k=0) :提取并构造一个对角数组
参数 :
a : array_like
k : [int, optional, 0 by default]
Diagonal we require; k>0 means diagonal above main diagonal or vice versa.
返回:
ndarray
Python
# Python Programming illustrating
# numpy.diag method
import numpy as geek
# matrix creation by array input
a = geek.matrix([[1, 21, 30],
[63 ,434, 3],
[54, 54, 56]])
print("Main Diagonal elements : \n", geek.diag(a), "\n")
print("Diagonal above main diagonal : \n", geek.diag(a, 1), "\n")
print("Diagonal below main diagonal : \n", geek.diag(a, -1))
输出 :
Main Diagonal elements :
[ 1 434 56]
Diagonal above main diagonal :
[21 3]
Diagonal below main diagonal :
[63 54]