R: Figure out margining variables.

margins {reshape2} | R Documentation

## Figure out margining variables.

### Description

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.

### Usage

    margins(vars, margins = NULL)

### Arguments

`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.

### Value

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

[Package reshape2 version 1.4.4 Index]