Problem 545. Flip the main diagonal of a matrix

Created by Bruce Raine

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

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80 solvers submitted 185 solutions (2.31 solutions/solver).

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Solution 71134

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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 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 545. Flip the main diagonal of a matrix

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80 solvers submitted 185 solutions (2.31 solutions/solver).

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