Returning to the old question ...
> Is it possible to subset an n-dimensional array by a
> vector of n dimensions?
On Sat, Jul 12, 2008 at 1:34 AM, Wolfgang Huber <[EMAIL PROTECTED]> wrote:
> > do.call("[", list(x,1,2,TRUE))
> [1] 3 9 15 21
>
> See also http
Kenn Konstabel wrote:
What is "wrong" is, I think, that you can't write a substitute for
x[1,2,] this way. (Or, in general, empty indexes won't work.)
A related question - Is there a way to replace x[1,2,] with "["(1,2,
*something clever*) ?
Kenn
Dear Kenn,
I can:
> do.call("[", list(x
What is "wrong" is, I think, that you can't write a substitute for x[1,2,]
this way. (Or, in general, empty indexes won't work.)
A related question - Is there a way to replace x[1,2,] with "["(1,2,
*something clever*) ?
Kenn
On Sat, Jul 12, 2008 at 12:48 AM, Wolfgang Huber <[EMAIL PROTECTED]>
Hi Richard,
what is wrong with Patrick's suggestion? I get
x <- array(1:24, dim=2:4)
x[rbind(c(1,1,2))]
## [1] 7
x[rbind(c(1,1,2))] <- 13
x[rbind(c(1,1,2))]
## [1] 13
And you could also do
do.call("[", list(x,1,1,2))
These should be a bit quicker than the eval/parse constructs - see also
In case anyone's still interested, I now have (I think!) a complete solution
(thanks to a quick look at my new favourite document - S Poetry :-)
subsetArray <- function(x, subset) {
subsetString <- paste(subset, collapse=",")
subsetString <- gsub("NA","",subsetString)
evalString <- paste(e
My understanding of matrix subscripting is that this can be used to access
arbitrary elements from an array and return them as a vector, but I don't
understand how that helps me here. I've now written a function that seems to do
what I originally wanted, but I've also realised I want to do assi
I think you are looking for subscripting with a
matrix:
x[cbind(1,1,2)]
See, for instance, the subscripting section of chapter 1
of S Poetry.
Patrick Burns
[EMAIL PROTECTED]
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")
Richard Pearson
Hi
Is it possible to subset an n-dimensional array by a vector of n dimensions?
E.g. assume I have
x <- array(1:24, dim=2:4)
x[1,1,2]
[1] 7
dims <- c(1,1,2)
I would like a function that I can supply x and dims as parameters to, and have
it return 7. Also, I would like to do something like
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