If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
Which values occur exactly three times?
Vectorize the digits of an Integer
Rotate a Matrix by 90 degrees
Remove the Zero
Musical Note Interval 1 - Diatonic Scale
Pattern Recognition 3 - Variable Unit and Array Length (including cell arrays)
Calculator spelling - Numbers to Letters
Lights Out 6 - 5x5, 13 moves
Scrabble Scores - 9
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