`reorder.snp` <-
function(x, ref="common", ...)
{
s <- x
if(!inherits(s,"snp")) {
stop("object must be of class 'snp'")
}
type <- charmatch(ref, c("common","minor"))
if (is.na(type)) {
stop("ref must be either 'common' or 'minor'")
}
class(s) <- "factor"
tt <- table(s)
if (type==1) {
if (length(tt) == 3 & min(tt) > 0) {
if (tt[1] < tt[3]) {
s <- relevel(relevel(s, 2), 3)
}
} else {
if (length(unique(unlist(strsplit(names(tt)[1], "/")))) == 2
& length(tt)>1) {
s <- relevel(s, 2)
}
}
} else {
if (length(tt) == 3 & min(tt) > 0) {
if (tt[3] < tt[1]) {
s <- relevel(relevel(s, 2), 3)
}
} else {
if (length(unique(unlist(strsplit(names(tt)[1], "/")))) == 2) {
s <- relevel(s, 2)
}
}
}
class(s) <- c("snp","factor")
s
}
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