http://www.jsoftware.com/jwiki/Essays/Tree%20Sum#Descendants
This page is immutable. The jwiki does not support "talk"
pages navigable from their primary pages, so I am posting
here.
The definition:
gen =: 3 : '(*c) #^:_1 (I.c) <@;/. (;y){y [ c=. #&> y'
could have instead been stated
gen=: ;@:{L:0 1~
FYI,
--
Raul
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