Question

How to find the sum of boundary elements of a matrix in Python

Answer 1

def getBoundarySum(matrix) :
    rows = len(matrix)
    cols = len(matrix[0])
    summ = 0
    i = 0
     
    while (i < rows) :
        j = 0
        while (j < cols) :
            if (i == 0 or j == 0 or i == rows - 1 or j == cols - 1) :
                summ += matrix[i][j]
            j += 1
        i += 1
     
    return summ
 
matrix = [[1,  2,  3,  4], 
          [5,  6,  7,  8], 
          [9, 10, 11, 12]]
           
# 1 + 2 + 3 + 4 + 8 + 12 + 11 + 10 + 9 + 5 + 65
 
print(getBoundarySum(matrix))



'''
run:

65

'''

        
        

 

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