dplyr::summarise column names that are numbers. Apply sum

summarise_numeric <- function(df, fun) {
  num_cols <- sapply(df, is.numeric)
  df[, num_cols] %>% summarise_all(fun)
}

dplyr::summarise(iris, mean = mean(Sepal.Length), sd = sd(Sepal.Length))
summarise_numeric(iris, mean)
summarise_numeric(iris, sd)

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