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Cumulate

Cumulate values among siblings

Description

For example, you can sum up values of siblings before this Node.

Usage

Cumulate(node, attribute, aggFun, ...)

Arguments

node

The node on which we want to cumulate
attribute

determines what is collected. The attribute can be

  • a.) the name of a field or a property/active of each Node in the tree, e.g. acme$Get("p") or acme$Get("position")

  • b.) the name of a method of each Node in the tree, e.g. acme$Get("levelZeroBased"), where e.g. acme$levelZeroBased <- function() acme$level - 1

  • c.) a function, whose first argument must be a Node e.g. acme$Get(function(node) node$cost * node$p)

aggFun

the aggregation function to be applied to the children's attributes
...

any arguments to be passed on to attribute (in case it's a function)

Examples

data(acme)
acme$Do(function(x) x$cost <- Aggregate(x, "cost", sum), traversal = "post-order")
acme$Do(function(x) x$cumCost <- Cumulate(x, "cost", sum))
print(acme, "cost", "cumCost")
data.tree

General Purpose Hierarchical Data Structure

v1.0.0
GPL (>= 2)
Authors
Russ Hyde [ctb] (improve dependencies), Chris Hammill [ctb] (improve getting), Facundo Munoz [ctb] (improve list conversion), Markus Wamser [ctb] (fixed some typos), Pierre Formont [ctb] (additional features), Kent Russel [ctb] (documentation), Noam Ross [ctb] (fixes), Duncan Garmonsway [ctb] (fixes), Christoph Glur [aut, cre] (R interface)
Initial release
2020-07-31

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