[Bug-apl] Is the index generator function definition allowed to work on vectors of any length?

[Leslie S Satenstein]

Re Gnu APL. 1,7-1

Gnu apl processes     ⍳ 2    5
as

 1 1  1 2  1 3  1 4  1 5

 2 1  2 2  2 3  2 4  2 5

and

⍳ 2    5    2

as

 1 1 1  1 1 2
 1 2 1  1 2 2
 1 3 1  1 3 2
 1 4 1  1 4 2
 1 5 1  1 5 2

 2 1 1  2 1 2
 2 2 1  2 2 2
 2 3 1  2 3 2
 2 4 1  2 4 2
 2 5 1  2 5 2

Since when does interval (index generator) take more than a scaler, or a vector with rho greater than 1 ?

Where would this (above example) be used?

Its not described in APL2, or the iso document.  I am searching dyalog's documentation and it's not there either.

Is this an interpreter error or some undocumented extension?

 

Regards

 Leslie

Leslie Satenstein

Montréal Québec, Canada