performance of apply
Sat, 30 May 1998 09:20:39 +1200 (NZST)
Subject: Re: performance of apply
From: Peter Dalgaard BSA <firstname.lastname@example.org>
Date: 29 May 1998 18:04:30 +0200
Oh, dear. Looking at apply, we have right in the middle of it:
for (i in 1:d2) ans[[i]] <- FUN(array(newX[, i], d.call,
Assignment to the tail of a very long list...
I think I'm beginning to understand why Ross keeps talking about
generic vectors. Either that or we need to add some low-level list
primitives to the language.
Got it in one. To reach ans[[i]] you have to cdr down the whole list.
The subsetting code would be vastly simplified without the special
list code. Ugliest of all is subscript manipulation for lists with
[ I estimate 2 months for a fix - not that it will take that long,
but there are some other things higher up the todo list ].
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