tf=~any(sum(x-length(x)^2-1)+norm(x,inf)) the best

x = magic(2);
y_correct = false;
This is wrong!!!! hence solution failed

Although MATLAB does create a 2x2 matrix as an output from magic(2), that output is not a magic square.

I'm pretty sure test 5 is wrong. magic(3)+1: sum of every row, column, and both diagonals is 18

It's not a normal magic square if it's of size 3x3 and doesn't sum to 15. All rows/cols/diags must sum to n*(n^2+1)/2.

I don't think this checks the diagonals. Is that because it's not necessary?

issame is from which toolbox ?

($matlabroot)/toolbox/robust/rctobsolete/robust/issame.m

passed in matlab but not here??what ??

Test 4 is wrong: y_correct should be = TRUE

No, test 4 is correct. magic(2) does not return a magic square.

Hein? -348052801600 where does this number come from?!

Note that this gives the wrong result for magic(4). I suspect that this is tailored to the test set.

I like this since there is nothing in the MATLAB doc which guarantees that magic() produces a normal magic square. Is it necessary to also check both diagonals?

Folks, I don't get it. If you create z= magic(3)', that's a magic square. No surprise. If you then do an isequal with magic(3), you fail the test. Thus this and all solutions of this class are wrong, marked as correct only because the tests don't offer transposed magic squares as a test. The test vector needs to be fixed so all these solutions show us as not working.