Python中的 numpy.triu()

numpy.triu(a, k = 0) ：返回具有三角形 wrt k上部的数组副本
参数 ：

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

返回：

Upper triangle of a, having same shape and data-type as a.

# Python Programming illustrating
# numpy. triu 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. triu(a), "\n")
  
print("Diagonal above main Diagonal elements : \n", geek. triu(a, 1), "\n\n")
  
print("Main Diagonal elements : \n", geek. triu(a, -1))

输出 ：

Main Diagonal elements : 
 [[  1  21  30]
 [  0 434   3]
 [  0   0  56]] 

Diagonal above main Diagonal elements : 
 [[ 0 21 30]
 [ 0  0  3]
 [ 0  0  0]] 


Main Diagonal elements : 
 [[  1  21  30]
 [ 63 434   3]
 [  0  54  56]]

参考 ：
https://docs.scipy.org/doc/numpy/reference/generated/numpy.triu.html#numpy.triu
笔记 ：
这些 NumPy-Python 程序不会在在线 IDE 上运行，因此请在您的系统上运行它们来探索它们。