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.
Find the numeric mean of the prime numbers in a matrix.
Which doors are open?
Find the two-word state names
Determine the square root
length of a vector
Increment a number, given its digits
Tune your guitar
Is my wife right?
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