The test suite does not check that the solution is a character string, but the problem definition requires that it should.
Added this check. (I messed it up a bit the first time I tried to do it, so sorry for some interim weirdness.)
str = num2str(A,formatSpec), could replace '
Invalid solution, really
New test suite invalidates this solution.
The Hitchhiker's Guide to MATLAB
Get the length of a given vector
Getting logical indexes
03 - Matrix Variables 2
So many choices
Is my wife right? Now with even more wrong husband
Maintain shape of logical-index mask
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