update.compareGroups<-
function (object, formula., ..., evaluate = TRUE)
{
if(!inherits(object, "compareGroups"))
stop("argument 'object' must be of class 'compareGroups'")
if(inherits(object, "compareGroups.subset"))
stop("Update process might not work properly (different variables selected) since 'obj' has been subset previously")
if(inherits(object, "rbind.compareGroups"))
stop("Update process does not work for rbind.compareGroups objects")
call <- attr(object,"call")$call
if (is.null(call))
stop("need an object with call component")
extras <- match.call(expand.dots = FALSE)$...
if (!missing(formula.)){
if (inherits(formula., "formula")){
if (inherits(eval(call$formula), "formula")){
call$formula <- update.formula2(call$formula, formula.)
}else {
call$data <- call$formula
call$formula <- formula.
}
} else {
call$formula <- formula.
}
}
if (length(extras)) {
existing <- !is.na(match(names(extras), names(call)))
for (a in names(extras)[existing]) call[[a]] <- extras[[a]]
if (any(!existing)) {
call <- c(as.list(call), extras[!existing])
call <- as.call(call)
}
}
if (evaluate)
eval(call, parent.frame())
else
call
}
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