margins: Figure out margining variables.
In reshape2: Flexibly Reshape Data: A Reboot of the Reshape Package

Given the variables that form the rows and columns, and a set of desired margins, works out which ones are possible. Variables that can't be margined over are dropped silently.

1	margins(vars, margins = NULL)

`vars`	a list of character vectors giving the variables in each dimension
`margins`	a character vector of variable names to compute margins for. `TRUE` will compute all possible margins.

list of margining combinations, or NULL if none. These are the combinations of variables that should have their values set to (all)

reshape2 documentation built on April 14, 2020, 5:26 p.m.