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## .doByLabels
## run a specific function labelwise
##
## params:
## l: list of AbstractMassObject objects
## labels: factor, labels for samples
## fun: function
##
## returns:
## list of modified AbstractMassObject objects
##
.doByLabels <- function(l, labels, FUN, ..., mc.cores=1L) {
## test parameters
.stopIfNotIsMassObjectList(l)
FUN <- match.fun(FUN)
if (!missing(labels)) {
## drop unused levels and turn argument into factor
if (is.factor(labels)) {
labels <- droplevels(labels)
} else {
## preserve order in labels
labels <- factor(labels, levels=unique(labels))
}
if (length(labels) != length(l)) {
stop("For each item in ", sQuote("l"), " there must be a label in ",
sQuote("labels"), "!")
}
## replace tapply by split to preserve order
tmp <- .lapply(split(unlist(l), labels), FUN=FUN, ..., mc.cores=mc.cores)
k <- unlist(tmp)
if (length(k) != length(tmp)) {
k <- unsplit(tmp, labels)
}
} else {
k <- FUN(l, ...)
}
k
}
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