x[1,], x[1,,], x[1,,,], ...
You can look at the definition of 'corner' in the public domain area of the Burns Statistics website. It uses 'do.call' on '[' to achieve (sort of) what you want. Patrick Burns patrick at burns-stat.com +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and "A Guide for the Unwilling S User")
Henrik Bengtsson wrote:
Hi,
is there a function in R already doing what I try to do below:
# Let 'x' be an array with *any* number of dimensions (>=1).
x <- array(1:24, dim=c(2,2,3,2))
...
x <- array(1:24, dim=c(4,3,2))
i <- 2:3
ndim <- length(dim(x))
if (ndim == 1)
y <- x[i]
else if (ndim == 2)
y <- x[i,]
else if (ndim == 3)
y <- x[i,,]
else ...
and so on. My current solution is
ndim <- length(dim(x))
args <- rep(",", ndim)
args[1] <- "i"
args <- paste(args, collapse="")
code <- paste("x[", args, "]", sep="")
expr <- parse(text=code)
y <- eval(expr)
ndim <- length(dim(x))
args <- rep(",", ndim)
args[1] <- "i"
args <- paste(args, collapse="")
code <- paste("x[", args, "]", sep="")
expr <- parse(text=code)
y <- eval(expr)
Is there another way I can do this in R that I have overlooked?
/Henrik
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