Python numpy.diagflat()用法及代码示例

numpy.diagflat(a，k = 0)：创建一个二维数组，其数组输入作为新输出数组的对角线。

参数：

a : array_like input data with diagonal  elements
strong>k : [int, optional, 0 by default]
          Diagonal we require; k>0 means diagonal  above main diagonal  or vice versa.

返回值：

array with the array_like input as a diagonal to the new output array.

# Python Program illustrating 
# numpy.diagflat method 
  
import numpy as geek 
  
print("diagflat use on main diagonal : \n", geek.diagflat([1, 7]), "\n") 
  
print("diagflat use on main diagonal : \n", geek.diagflat([1, 7, 6]), "\n") 
  
# Diagnol above main diagnol 
print("diagflat above main diagonal : \n", geek.diagflat([1, 7, 6], 1), "\n")

输出：

diagflat use on main diagonal  : 
 [[1 0]
 [0 7]] 

diagflat use on main diagonal  : 
 [[1 0 0]
 [0 7 0]
 [0 0 6]] 

diagflat above main diagonal  : 
 [[0 1 0 0]
 [0 0 7 0]
 [0 0 0 6]
 [0 0 0 0]]