How to convert Two Dimensional list to Array?

Programming Language
#1

Both lists and NumPy arrays are inter-convertible. Since NumPy is a fast (High-performance) Python library for performing mathematical operations so it is preferred to work on NumPy arrays rather than nested lists.

Method 1: Using numpy.array().

Approach :

  • Import numpy package.
  • Initialize the nested list and then use numpy.array() function to convert the list to an array and store it in a different object.
  • Display both list and NumPy array and observe the difference.

Example:

# importing numpy library 
import numpy 

# initializing list ls = [[1, 7, 0], [ 6, 2, 5]] 
# converting list to array ar = numpy.array(ls) 

# displaying list 
print ( ls) 

# displaying array 
print ( ar)

Output :

[[1, 7, 0], [6, 2, 5]] 
[[1 7 0] [6 2 5]]

Method 2: Using numpy.asarray().

Approach :

  • Import numpy package.
  • Initialize the nested 4-dimensional list and then use numpy.asarray() function to convert the list to the array and store it in a different object.
  • Display both list and NumPy array and observe the difference.

Example:


# importing numpy library 
import numpy 
# initializing list ls = [[1, 7, 0],[ 6, 2, 5],[ 7, 8, 9],[ 41, 10, 20]] 

# converting list to array ar = numpy.asarray(ls) 
# displaying list print ( ls) 
# displaying array print ( ar)

Output :

[[1, 7, 0], [6, 2, 5], [7, 8, 9], [41, 10, 20]] 
[[ 1 7 0] [ 6 2 5] [ 7 8 9] [41 10 20]]