On Wed, Jul 8, 2009 at 9:40 AM, Henrique Dallazuanna <www...@gmail.com>wrote:
> Its because '[[' accept only element, so you need use '[':
>
> q[crossRsorted[,1]]
>
This appears to be doing something different. For instance, my 'q' has 165
components, but what you suggest has 15750:
> length(q)
[1] 165
> length(q[ crossRsorted[,1] ])
[1] 15750
hardly what I want.
Meanwhile, it looks as though [[ ]] does not vectorize its arguments, it
curries them!
Note that:
> q[[c(105,104)]]
Error in q[[c(105, 104)]] : subscript out of bounds
gives the same error as:
> q[[105]][[104]]
Error in q[[105]][[104]] : subscript out of bounds
Very mysterious, though, in all fairness, explained in help("[[") where it
says:
'[[' can be applied recursively to lists, so that if the single
index 'i' is a vector of length 'p', 'alist[[i]]' is equivalent to
'alist[[i1]]...[[ip]]' providing all but the final indexing
results in a list.
which leads to square one: how to express "select all r[i] where q[[i]]
fulfills some predicate?"
- Godmar
[[alternative HTML version deleted]]
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