Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18371#discussion_r123404096
--- Diff: R/pkg/R/functions.R ---
@@ -34,6 +34,30 @@ NULL
#' df <- createDataFrame(cbind(model = rownames(mtcars), mtcars))}
NULL
+#' Math functions for Column operations
+#'
+#' Math functions defined for \code{Column}.
+#'
+#' @param x Column to compute on. In \code{shiftLeft}, \code{shiftRight}
and \code{shiftRightUnsigned},
+#' this is the number of bits to shift.
+#' @param y Column to compute on.
+#' @param ... additional argument(s).
+#' @name column_math_functions
+#' @rdname column_math_functions
+#' @family math functions
+#' @examples
+#' \dontrun{
+#' # Dataframe used throughout this doc
+#' df <- createDataFrame(cbind(model = rownames(mtcars), mtcars))
+#' tmp <- mutate(df, v1 = log(df$mpg), v2 = cbrt(df$disp),
+#' v3 = bround(df$wt, 1), v4 = bin(df$cyl),
+#' v5 = hex(df$wt), v6 = toDegrees(df$gear),
+#' v7 = atan2(df$cyl, df$am), v8 = hypot(df$cyl, df$am),
+#' v9 = pmod(df$hp, df$cyl), v10 = shiftLeft(df$disp, 1),
+#' v11 = conv(df$hp, 10, 16))
--- End diff --
agreed we don't need to have example for each of atan/tan/cos/sin/sinh etc..
how about adding back one of each of these though
```
sign(df$c)
signum(df$c)
ceil(df$c)
ceiling(df$c)
sqrt(df$c)
```
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