Metadata, policies, and rule sugar for a sample frame

Thin convenience wrappers over add_rule() plus metadata/policy setters.

Usage

add_meta(sfw, ...)

set_policy(sfw, ...)

add_function(sfw, name, value = NULL, fn = NULL)

add_view(sfw, name, rows, cols = NULL, value = NULL, fun = "length")

add_refresh(
  sfw,
  name,
  fn = NULL,
  action = NULL,
  cols = NULL,
  by = NULL,
  value = NULL,
  into = NULL,
  fun = NULL
)

Arguments

sfw: A sample frame.
...: Named metadata (add_meta) or named policies (set_policy).
name: Rule name.
value: A function body string (add_function) or a view's value column (add_view).
fn: A function object (add_function/add_refresh).
rows, cols: A view's grouping column(s) (add_view); cols also names the columns for a droplevels/factor refresh.
fun: A view's aggregation, or the statistic for a group_stat refresh.
action: A built-in refresh: "droplevels", "factor", or "group_stat" (add_refresh).
by, into: Group column and output column for a group_stat refresh.

Value

The updated sample frame.