A little warm-up to begin...
An n-digit number is pandigital if it makes use of all the digits 1 to n exactly ONCE.
For example, the 5-digit number 15234, is 1 through 5 pandigital.
Given a positive integer find whether it is a pandigital number.
"Low : High - Low : High - Turn around " -- Create a subindices vector
Multiply a column by a row
Convert a Cell Array into an Array
Permute diagonal and antidiagonal
Longest Collatz Sequence
Mysterious digits operation (easy)
How to reverse spdiags ?
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