Displaying 3 results from an estimated 3 matches for "extractrow".
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2018 Jun 08
1
Subsetting the "ROW"s of an object
On 06/08/2018 10:15 AM, Michael Lawrence wrote:
> There probably should be an abstraction for this. In S4Vectors, we
> have extractROWS().
FWIW the code in S4Vectors that does what your subset_ROW() does is:
https://github.com/Bioconductor/S4Vectors/blob/04cc9516af986b30445e99fd1337f13321b7b4f6/R/subsetting-utils.R#L466-L476
(This is the default "extractROWS" method.)
Except for the normalization of 'i', it...
2018 Jun 08
6
Subsetting the "ROW"s of an object
Hi all,
Is there a better to way to subset the ROWs (in the sense of NROW) of
an vector, matrix, data frame or array than this?
subset_ROW <- function(x, i) {
nd <- length(dim(x))
if (nd <= 1L) {
x[i]
} else {
dims <- rep(list(quote(expr = )), nd - 1L)
do.call(`[`, c(list(quote(x), quote(i)), dims, list(drop = FALSE)))
}
}
subset_ROW(1:10, 4:6)
#> [1] 4 5 6
2018 Jun 08
0
Subsetting the "ROW"s of an object
There probably should be an abstraction for this. In S4Vectors, we
have extractROWS().
Michael
On Fri, Jun 8, 2018 at 8:45 AM, Hadley Wickham <h.wickham at gmail.com> wrote:
> Hi all,
>
> Is there a better to way to subset the ROWs (in the sense of NROW) of
> an vector, matrix, data frame or array than this?
>
> subset_ROW <- function(x, i) {
> n...