Problem 1153. Accessing elements on the diagonal

Created by HARISANKAR PS

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Access the diagonal elements of a matrix without 'diag' function

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180 Solutions
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Last Solution submitted on Apr 05, 2020

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Richard Zapor on 30 Dec 2012

Confused by test 6, x = [1:3;4:6;7:9;10:12]';
y_correct = [1 6 11]; I think this should be [1 5 9] as array is [1 4 7 10;2 5 8 11;3 6 9 12]

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Solution 183476

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Khaled Hamed on 30 Dec 2012

Right solution to right problem

Solution 183474

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Duane Hanselman on 30 Dec 2012

Test #5 is incorrect. Transpose on x makes the diagonal [1 5 9], [1 6 11] are not on any diagonal. #5 is the transpose of #4 and taking the transpose does not change the diagonal, unless you have some other definition for diagonal. A good solution is x(find(eye(size(x))))

Solution 183472

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Khaled Hamed on 30 Dec 2012

Rigt solution for wrong problem

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Problem 1153. Accessing elements on the diagonal

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Problem 1153. Accessing elements on the diagonal

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