Nothing
shuffle <- function(x,who,after=NA){
names(x) <- make.unique(names(x))
who <- names(x[,who,drop=FALSE])
nms <- names(x)[!names(x) %in% who]
if(is.null(after)) after <- length(nms)
if(is.na(after)) after <- 0
if(length(after)==0) after <- length(nms)
if(is.character(after)) after <- match(after, nms, nomatch = 0)
if(after < 0) after <- length(nms)
if(after > length(nms)) after <- length(nms)
nms <- append(nms, who, after = after)
x[nms]
}
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