Well I never!

[Robert Brenstein]

On 26.03.09 at 23:47 -0700 James Hurley apparently wrote:
>Watching the web demo today I witnessed a funny thing. It looked like this
>
>twoDimenArray ["stuff"] ["moreStuff"]
>
>I said to myself, So THIS must be the two dimensional arrays I've heard about.
>
>Now silly me, I've been using
>
>oneDimenArray[i,j]
>
>Which I suppose now must be one dimensional arrays where the keys 
>are lists of two parameters. (But it sure looks like the two 
>dimensional arrays I held near and dear to my heart, low these many 
>years.)
>

Jim,

A short answer can be:

think of multi-dimensional array in Rev as an array of arrays.

A long answer is, well, longer and covers some of the obvious:

An array variable in Rev is a container storing a list of values 
which are indexed for retrieval. It is implemented as an associative 
array.

http://en.wikipedia.org/wiki/Associative_array

Since the keys of such an array can be anything, you can use two 
variables or literals with a comma in-between as index elements. This 
makes such an array appear like multi-dimensional arrays of Pascal, 
C, Fortran, etc., although technically, you still have 
one-dimensional array (each key is effectively a single string, a 
concatenation of your variables and comma).

Until now, this was the only way to get multi-dimensionality of your data.

Multi-dimensional arrays go way beyond that, making the index for 
each dimension independent, which Trevor so nicely explained and 
showed some of the new things possible.

Robert