update_prop: Update a data set with recursively-defined properties

In rollupTree: Perform Recursive Computations

Update a data set with recursively-defined properties

Description

update_prop calls user-specified methods to get properties of a source set of elements in a data set, combine those properties, and set the properties of a target element to the combined value. If the source set is empty, the data set is returned unmodified. The default combine operation is addition.

The override argument can be used to selectively override the computed value based on the target element. By default, it simply returns the value computed by the combiner.

Usage

update_prop(
  ds,
  target,
  sources,
  set,
  get,
  combine = function(l) Reduce("+", l),
  override = function(ds, target, v) v
)

Arguments

ds	data set to be updated
target	key of data set element to be updated
sources	keys of data set elements to be combined
set	function to set properties for a target element called as set(ds, key, value)
get	function to get properties for source elements called as get(ds, key)
combine	function to combine properties called as combine(vl)
override	function to selectively override combined results called as override(ds, key,)

Value

updated data set

Examples

update_prop(wbs_table, "1", list("1.1", "1.2"),
  function(d, k, v) {d[d$id == k, "work"] <- v; d},
  function(d, k) d[d$id == k, "work"]
 )
update_prop(wbs_table, "1", list("1.1", "1.2"),
  function(d, k, v) {d[d$id == k, c("work", "budget")] <- v; d},
  function(d, k) d[d$id == k, c("work", "budget")],
  function(l) Reduce("+", l)
)

rollupTree documentation built on Feb. 10, 2026, 5:09 p.m.