Divvy: Divvy Function
In rcorty/CortyKit: Robert Corty's Utility Functions

Description Usage Arguments Details Value Author(s) Examples

This function splits the integers from 1 to n into g groups and returns the ith group. All of this is straightforward, but it's important to do it in a consistent way for splitting up data/analyses.

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Divvy(first.idx, last.idx, which.group,
  num.groups = ceiling(n.idxs/group.size),
  group.size = ceiling(n.idxs/num.groups))

`num.groups`	number of groups to divvy the items into, defaults to `ceiling(n/group.size)`
`group.size`	size of each group, defaults to `ceiling(n/num.groups)`
`n`	number of items to divvy up
`i`	group of items to return

The gth group may be smaller than the other groups

the indices of the ith group of size g in 1:n

Robert Corty

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Divvy(first.idx = 10, last.idx = 50, num.groups = 3, which.group = 1)
Divvy(first.idx = 10, last.idx = 50, num.groups = 3, which.group = 2)
Divvy(first.idx = 10, last.idx = 50, num.groups = 3, which.group = 3)