Ric Sherlock wrote:
|Using some rough transliteration where
|<- is assign
|_ is high minus
|[] is quad.
|
|In APL+Win with []io <-0
|x <- 3 4 5
|y <- 2 3 9
|
| x,[_0.5] y
|3 4 5
|2 3 9
|
|Which certainly seems to be equivalent to the behaviour of x,:y in J??
|
|---Randy MacDonald wrote:
|> No, it isn't.
|>
|> Roger Hui wrote:
|> > x,[_0.5] y in APL is equivalent to x,:y in J.
Based on Randy's first response to this question, I researched this more
deeply, and Ken Iverson ("A Dictionary of APL", APL Quote Quad 18:1, p.
14) states the following (which none of my APL books indicated):
A fractional value of i in the expression a,[i]b provides
*lamination*, inserting a new axis of length 2 between axes <floor>i
and <ceiling>i. For example:
a <- 3 + b <- <count>3
a,[.5]b a,[_.5]b
3 0 3 4 5
4 1 0 1 2
5 2
Harvey
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