Take input data and define a mapping between faceting variables and ROW, COL and PANEL keys

Take input data and define a mapping between faceting variables and ROW, COL and PANEL keys

Usage

combine_vars(data, env = emptyenv(), vars = NULL, drop = TRUE)

Arguments

data

A list of data.frames, the first being the plot data and the subsequent individual layer data

env

The environment the vars should be evaluated in

vars

A list of quoted symbols matching columns in data

drop

should missing combinations/levels be dropped

Value

A data.frame with columns for PANEL, ROW, COL, and faceting vars