1. Python
  2. numpy.alen () in Python

numpy.alen () in Python



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