unfold_idx {dfidx}

Fold and Unfold a dfidx object

Description

fold_idx takes a dfidx, includes the indexes as stand alone columns, remove the idx column and return a data.frame, with an ids attribute that contains the informations about the indexes. fold_idx performs the opposite operation

Usage

unfold_idx(x)

fold_idx(x, pkg = NULL)

Arguments

x

a dfidx object

pkg

if not NULL, this argument is passed to dfidx

Value

a data.frame for the unfold_dfidx function, a dfidx object for the fold_dfidx function

Author(s)

Yves Croissant

Examples

if (requireNamespace("AER")){
data("TravelMode", package = "AER")
TM <- dfidx(TravelMode)
TM2 <- unfold_idx(TM)
attr(TM2, "ids")
TM3 <- fold_idx(TM2)
identical(TM, TM3)
}