On Mar 13, 2008, at 14:10 , Peter Stewart wrote: > How do I nest Intervals so that I may reference a Matrix > an element at a time? Matrix at: i at j. Thanks. 1 to: matrix height do: [:j | 1 to: matrix width do: [:i | (matrix at: i at: j) doSomething]] Or did I misunderstand your question? - Bert -