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.
Replace NaNs with the number that appears to its left in the row.
Check if sorted
Given a matrix, swap the 2nd & 3rd columns
Compare two input matrices
Number Puzzles - 011
Number Puzzle - 113
Number Puzzle - 043
Number Puzzle - 076
Number Puzzles - 016
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