Great!
Thanks a lot, Enrico
2013/4/2 Duncan Murdoch <murdoch.dun...@gmail.com>
> On 02/04/2013 6:36 AM, Enrico Bibbona wrote:
>
>> Is there any function that extends to multidimentional arrays the
>> functionalities of "row" and "col" which are just defined for matrices?
>> Thanks, Enrico Bibbona
>>
>
> Not as far as I know, but there are a lot of functions in packages.
>
> You could write your own something like this. I've skipped any error
> checking; you'll want to add that.
>
> indices <- function(a, which) {
> d <- dim(a)
> prod_before <- prod(d[seq_len(which-1)])
> result <- rep(seq_len(d[which]), each=prod_before, length.out = prod(d))
> dim(result) <- d
> result
> }
>
> Then indices(a, 1) gives an array of the same shape as a where entry i, j,
> k, ... is i, indices(a, 2) has entry i,j,k, ... equal to j, etc.
>
> Duncan Murdoch
>
>
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
