Create a matrix Z with m rows and n columns that contain the numbers 1 to m*n in ascending order in the following manner. The first row will contain numbers 1 to n. The second row will contain n+1 to 2n and so on. Thus, if m = 3, n = 4, the output matrix Z will have 3 rows and 4 columns and will be the following:
[1 2 3 4;
5 6 7 8;
9 10 11 12]
This become trivial if you use loops, but do this without using loops, i.e. for/while not permitted. Additionally, the reshape command makes this very easy, so avoid that as well.
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Your test suite detecting for loops is overzealous and trips up on arrayfun(..., "UniformOutput", false).
Fortunately, there is an abbreviation that can be used that will not be triggered by searches for "for": arrayfun(..., "Uni", 0). Incidentally, "Un" (or "un") can also be used while 0 is equivalent to false in this context. These abbreviations also work for cellfun.
Technically, arrayfun (cellfun as well) is just a loop in disguise. All in all, OP is asking for a vectorized solution.
@Dyuman You're right of course, but technically the problem description also says "do this without using loops, i.e. for/while not permitted", so arrayfun, cellfun and all the other kinds of fun that you can have with MATLAB are permitted. :)