# numpy.triu() in Python

• Last Updated : 09 Mar, 2022

numpy.triu(a, k = 0) : Returns copy of array with upper part of the triangle w.r.t k
Parameters :

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

Returns :

`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``))`

Output :

```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]]
```

Reference :
https://docs.scipy.org/doc/numpy/reference/generated/numpy.triu.html#numpy.triu
Note :
These NumPy-Python programs won’t run on online IDE’s, so run them on your systems to explore them.

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