Hi, Eric,
as a quick hack, does
spots <- sapply( alist,
function( listcomp)
which( listcomp == value.to.look.for) )
spots[ sapply( spots, length) == 0] <- NULL
do what you want?
Regards -- Gerrit
On Thu, 28 Mar 2013, Eric Rupley wrote:
Dear All,
This is a simple question, but I'm stumped about the simplest way to
search a list object such as the following:
This randomish snippet:
n <- c(round(runif(round(runif(1,1,10),0),1,10),0))
alist <- new("list")
for (i in seq_along(n)) {
alist[[i]] <- c(round(runif(round(runif(1,1,10),0),1,10),0))
}
names(alist) <- sample(letters[1:length(n)])
rm(n);c(alist)
...produces something like this:
$d
[1] 4
$b
[1] 3 5 3
$a
[1] 2 5 7 3 10 3 4 9 9
$c
[1] 6 3 7 4 5 10 8 10 3
My question is how does one search the list for a given value, in a most
compressed set of commands, in order two return two separate indices: a) the
index of the list element(s) containing the value, and b) the index of the
matching value(s) within the vector.
Right now, I'm writing cumbersome loops to iterate though the elements, but
there must be a simple, effective method to which I have not found a reference.
Many thanks in advance, and apologies if I have overlooked a reference passage.
Best,
Eric
--
Eric Rupley
University of Michigan, Museum of Anthropology
1109 Geddes Ave, Rm. 4013
Ann Arbor, MI 48109-1079
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