CODEWITHSUNDEEP
pythonpython-3.x
GZeuS
GZeuS

Reputation: 5

Center of a matrix

so what I need to do is to tell the user to type values for a matrix and print the center of this one. I've this code but I´m missing that.

import sys
reng = int(input('row: '))
column = int(input('column: '))
matrix = []
suma = 0
lista = []

if reng < 0 or column < 0:
    print('NOT VALID')
    sys.exit()

else:
    for i in range(reng):
        matrix.append([0]*column)

    for j in range(reng):
        for k in range(column):
            matrix[j][k] = int(input('enter an integer: '))
print(matrix)

Upvotes: 0

Views: 1281

Answers (1)

tevemadar
tevemadar

Reputation: 13195

print(matrix[reng//2][column//2])

will print you the exact middle element of an "odd*odd" matrix. // is integer division, so for example 3//2 is 1, which really is the middle one of possible indices 0, 1, 2. Even numbers have a middle-pair, and division produces the higher one (like in case of 4: 4//2 is 2, which is the "upper middle" element of the possible indices 0, 1, 2, 3).

Upvotes: 1

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