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      How to create matrix in Python

      • Posted by Python Point Team
      • Categories Python
      • Date November 24, 2020
      • Comments 0 comment
      matrix creation in python

      A Matrix is a rectangular array of data or numbers. The horizontal entries in a matrix are called as ‘rows’ while the vertical entries are called as ‘columns’. If matrix has m number of rows and n number of columns, then the order of the matrix is given as m x n.

      Lets go through some methods for creating matrix in Python.

      Method 1:

      m = int(input("No. of rows: "))
      n = int(input("No. of columns: "))
      
      matr = []
      print("Enter the entries rowwise:")
      
      for i in range(m):          #loop for row entries
          x = []
          for j in range(n):       #loop for column entries
              x.append(int(input()))
          matr.append(x)
      
      #printing matrix
      for i in range(m):
          for j in range(n):
              print(matr[i][j], end=" ")
          print()
       

      Output:

      No. of rows: 2
      No. of columns: 3
      Enter the entries rowwise:
      1
      2
      3
      4
      5
      5
      1 2 3
      4 5 5

      Method 2: Using map() function and Numpy.

      NumPy is a Python library for scientific computations and multidimensional arrays. We can use NumPy to create matrix.

      import numpy as np
      
      m = int(input("No. of rows: "))
      n = int(input("No. of columns: "))
      
      matr = []
      print("Enter the entries in single line separated by space:")
      
      ele = list(map(int,input().split()))
      
      #printing matrix
      matrix = np.array(ele).reshape(m, n)
      print(matrix)
      

      Output:

      No. of rows: 3
      No. of columns: 4
      Enter the entries in single line separated by space:
      1 2 3 4 5 6 7 8 9 10 11 12
      [[ 1  2  3  4]
       [ 5  6  7  8]
       [ 9 10 11 12]]
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