  # numpy.alen () in Python

NumPy | Python Methods and Functions

`numpy.alen()` is used to return the length of the first dimension of the input array.

Syntax: numpy.alen (arr)

Parameters:
arr: [array_like] Input array.

Return: [int] Length of the first dimension of arr.

Code # 1:

 ` # Python program explaining ` ` the # alen () function ` ` `  ` import ` ` numpy as geek `   ` # input array (2 * 3) ` ` in_arr ` ` = ` ` geek.array ([[` ` 2 , 0 , 7 ], [ 0 , 5 , 9 ]]) `` print ( "Input array:" , in_arr)     out_dim = geek.alen (in_arr) print ( "Length of the first dimension of arr:" , out_dim) `

Output:

` Input array: [[2 , 0, 7], [0, 5, 9]] Length of the first dimension of arr: 2 `

Code # 2:

` # Python program explaining # alen () function    import numpy as geek   # input array (1 * 3 * 3) in_arr = geek.arange ( 9 ). reshape ( 1 , 3 , 3 ) print ( " Input array: " , in_arr)    out_dim = geek.alen (in_arr) print ( "Length of the first dimension of arr:" , out_dim) `

` ` Exit:

` Input array: [[[0 1 2] [3 4 5] [6 7 8]]] Length of the first dimension of arr: 1 `