On Jun 1, 2007, at 12:37 PM, Devon McCormick wrote:

I don't see any two-dimensional arrays mentioned in this discussion -
I was not aware that APL's iota had been enhanced to work on such arrays.

J noticed that Arthur Whitney's K treated arrays of any dimension as first-axis objects. It took very little thought to realize that Arthur was correct. This is why J was first-axis, too. The rule applies to any arrays: vectors, matrices, and higher dimensional objects.
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