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#' Extract a pim environment from a model or formula
#'
#' This function allows you to extract the
#' \code{\link{pim.environment}} object from either a \code{pim}
#' object or a \code{pim.formula} object.
#'
#' @param x either a \code{pim} or a \code{pim.formula} object
#'
#' @return In case of a \code{pim} object, the \code{pim.environment}
#' contained therein. In case of a \code{pim.formula} object,
#' the environment itself.
#' See the help page \code{pim.formula-class}.
#'
#' @examples
#' data("FEVData")
#' # Create the "model frame"
#' FEVenv <- new.pim.env(FEVData, compare="unique")
#'
#' # create the formula and bind it to the pim.environment.
#' FEVform <- new.pim.formula(
#' Age ~ I(L(Height) - R(Height)) ,
#' FEVenv
#' )
#' theEnv <- penv(FEVform)
#' ls(theEnv)
#'
#' themodel <- pim(Age ~ Height, FEVenv)
#' thePEnv <- penv(themodel)
#' thePEnv
#'
#' ls(thePEnv)
#' # Note that this is a different environment, and that it only contains
#' # the variables in the formula, contrary to the environment created
#' # by new.pim.formula
#' @export
setGeneric("penv",
function(x) standardGeneric("penv"))
#' @rdname penv
setMethod("penv",
signature = "pim.formula",
function(x) x@penv)
#' @rdname penv
setMethod("penv",
signature = "pim",
function(x) x@penv)
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