Question

How to subtract two matrices (matrix) in Python

Answer 1

matrix1 = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 7, 6, 3]]
matrix2 = [[1, 1, 1, 1], [2, 2, 2, 2], [3, 3, 3, 3]]
sub = [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
    
rows = len(matrix1)
cols = len(matrix1[0])
    
i = 0
while (i < rows) :
    j = 0
    while (j < cols) :
        sub[i][j] = matrix1[i][j] - matrix2[i][j]
        j += 1
    i += 1
    
i = 0
while (i < rows) :
    j = 0
    while (j < cols) :
        print(str(sub[i][j]) + " ", end ="")
        j += 1
    print("\n", end ="")
    i += 1
    
    
   
    
'''
run:

0 1 2 3 
3 4 5 6 
6 4 3 0 

'''

 

70+ SQL courses for beginners and professionals

Answer 2

matrix1 = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 7, 6, 3]]
matrix2 = [[1, 1, 1, 1], [2, 2, 2, 2], [3, 3, 3, 3]]
sub = [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
    
rows = len(matrix1)
cols = len(matrix1[0])
    
for i in range(0, rows):
    for j in range(0, cols):
        sub[i][j] = matrix1[i][j] - matrix2[i][j]
    
for i in range(0, rows):
    for j in range(0, cols):
        print(str(sub[i][j]) + " ", end ="")
    print("\n", end ="")    

    
    
   
    
'''
run:

0 1 2 3 
3 4 5 6 
6 4 3 0 

 

70+ SQL courses for beginners and professionals