Doddy, the test suite does not check that the numbers are prime and five-digit. I recommend including assert(all(isprime(a)) && all(a > 9999 & a < 1e5)).
@ChrisR: your suggested tests have been added.
Find the sum of all the numbers of the input vector
Increment a number, given its digits
02 - Vector Variables 1
Draw a 'N'!
Double all elements in the array
Number Puzzle - 047
Polygon in a unit circle
Number Puzzle - 038
Number Puzzle - 032
Number Puzzle - 086
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