Problem 545. Flip the main diagonal of a matrix

Created by Bruce Raine

Solve Later

Given a n x n matrix, M, flip its main diagonal.

Example:

 >> M=magic(5);

 >> flipDiagonal(M)

     9    24     1     8    15
    23    21     7    14    16
     4     6    13    20    22
    10    12    19     5     3
    11    18    25     2    17

Solve

Solution Stats

1188 Solutions
448 Solvers

Last Solution submitted on May 22, 2020

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

goc3 on 24 Feb 2017

Additional test cases have been added.

Solution Comments

Solution 71134

2 Comments

2 Comments

Kees Roos on 13 Apr 2012

Dear @bmtran, how can does work? I ask this because you add the vector diag(M) to a matrix. I think you should write
diag(diag(M)) instead of diag(M). Am I wrong?

@bmtran (Bryant Tran) on 14 Apr 2012

it should be fairly easy to diagnose what i'm doing if you run each argument of my code separately in MATLAB and look at what it's doing, but I don't wanna give anything away to people who have yet to solve this problem.

Problem Recent Solvers448

Problem Tags

diagonal magic