add-all-combinations-dk: Add all combinations

In reshape: Flexibly Reshape Data

Add all combinations

Description

Add all combinations of the given rows and columns to the data frames.

Usage

add.all.combinations(data, vars = list(NULL), fill=NA)

Arguments

data	data.frame
vars	variables (list of character vectors)
fill	value to fill structural missings with

Details

This function is used to ensure that we have a matrix of the appropriate dimensionaliy with no missing cells.

Author(s)

Hadley Wickham <[e-mail]>

Examples

rdunif <- 
function(n=20, min=0, max=10) floor(runif(n,min, max))
df <- data.frame(a = rdunif(), b = rdunif(),c = rdunif(), result=1:20)
add.all.combinations(df)
add.all.combinations(df, list("a", "b"))
add.all.combinations(df, list("a", "b"), fill=0)
add.all.combinations(df, list(c("a", "b")))
add.all.combinations(df, list("a", "b", "c"))
add.all.combinations(df, list(c("a", "b"), "c"))
add.all.combinations(df, list(c("a", "b", "c")))

reshape documentation built on June 19, 2025, 5:08 p.m.