Problem 45502. Basic Operation with the middle number of odd matrix

Created by Muhammad Usman

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Take an odd matrix like 3-by-3
Access the middle element of the matrix i.e in case of 3-by-3 matrix the index of the particular element is second row, second column.
Now, sum the elements in its column to it and then subtract the elements in its row to it.
What's the matrix with updated element.

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Last Solution submitted on Jul 31, 2024

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William on 8 May 2020

As i understand it, the algorithm is only supposed to change the middle element of the matrix. That means the answer to problem 1 in the test suite is incorrect.

Muhammad Usman on 8 May 2020

@William, the problem is not only to change the middle term but to do basic operations with it.
In the first suite 5 is the middle number, add 2 and 8 (column elements) and then subtract 4 and 10 (row elements), so 5+2+8-4-10 = 1

William on 9 May 2020

Hi Muhammad,
Yes, I understand how the value x(2,2) was calculated, but why did the values of x(1,2) and x(3,2) change?

Binbin Qi on 9 May 2020

I do not understand why all the element in the second column equal 1 in the first test suit?

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Problem 45502. Basic Operation with the middle number of odd matrix

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Problem 45502. Basic Operation with the middle number of odd matrix

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Last 200 Solutions

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Problem Recent Solvers28

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