Hi everyone
apltake(x,1)
[where apltake() is part of library(magic)]
does this.
best wishes
Robin
On 23 Nov 2005, at 10:50, 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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--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
tel 023-8059-7743
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