I think that this is should be equivalent to the while version. Except that as pointed out by Henry Rich some years ago, the execution sequence of a for_x loop is undefined in the dictionary, so that the items of the resulting r may not be in the correct order. If paranoid, think twice before using a for_x loop.

Terrence Brannon wrote:
RE: http://www.jsoftware.com/help/primer/basic_list_adding.htm

I think it would be nice to poke people's memory with a for_item. based example
instead of just using while.
Here's the naive version, done with for

addlis =: 4 : 0
r =. ''
for_i. x
do.
  r =. r , (i_index { x) + (i_index { y)
end.
r
)



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--
regards,
bill
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