split_labels

list

all possible combinations should be considered, or only those present in the data

whether

Generate labels for split data frame. Create data frame
  giving labels for split data frame.

internal

plyr is a set of tools that solves a common set of
        problems: you need to break a big problem down into manageable
        pieces, operate on each pieces and then put all the pieces back
        together.  For example, you might want to fit a model to each
        spatial location or time point in your study, summarise data by
        panels or collapse high-dimensional arrays to simpler summary
        statistics. The development of plyr has been generously
        supported by BD (Becton Dickinson).

split_labels: Generate labels for split data frame.

Description

Usage

Arguments