Nothing
mean.folder <- function(x, ..., na.rm = FALSE) {
# 'mean' method for objects of class 'folder': colMeans per data frame.
fold <- x
x <- fold[[1]]
jnum <- logical(ncol(x))
for (j in 1:ncol(x)) {
jnum[j] <- is.numeric(x[, j])
}
notnum <- colnames(x)[!jnum]
if (length(notnum) > 0)
warning(paste("There are omitted variables (non numeric): ", paste(notnum, collapse = " "), sep = ""), immediate. = TRUE)
fold.num <- vector("list", length(fold))
for (n in 1:length(fold.num))
fold.num[[n]] <- fold[[n]][jnum]
names(fold.num) <- names(fold)
return(lapply(fold.num, colMeans, na.rm = na.rm))
}
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