Dear J Forum
Dyalog APL allows f <- where f is a dyadic function, as in
a <- 10 rho 0
a[2 2 5 6 2] + <- 3 4 5 6 7
a
0 0 14 0 0 5 6 0 0 0
How do I do this in J?
Amend won't do it - I didn't expect it to.
a=: 10$0
a=: a+(3 4 5 6 7)(2 2 5 6 2)}a
a
0 0 7 0 0 5 6 0 0 0
The difference arises when indices are repeated, the index 2 in the example.
3 4 5 6 7 is a list of contributions and 2 2 5 6 2 is a list of
destinations.
Any suggestions will be appreciated.
Regards
Graham Parkhouse
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