Nothing
# -----------------------------------------------------------------------------
# REPLACEMENT : lhs<-
# -----------------------------------------------------------------------------
#' @rdname formula.parts
#' @name lhs<-
#' @export lhs<-
#' @include parts.lhs.get.R
setGeneric( 'lhs<-', function( x, value ) standardGeneric('lhs<-') )
# -------------------------------------
# SINGLULAR: call, formula
# -------------------------------------
# @rdname formula.parts
# @aliases .replace.lhs.singular
.replace.lhs.singular <- function( x, value ) {
if( is.two.sided(x) ) {
x[[2]] <- value
} else {
x[[3]] <- x[[2]]
x[[2]] <- value
}
x
}
#' @rdname formula.parts
#' @name lhs<-
#' @aliases lhs<-,call-method
setReplaceMethod( 'lhs', 'call', .replace.lhs.singular )
#' @name lhs<-
#' @rdname formula.parts
#' @aliases lhs<-,formula-method
setReplaceMethod( 'lhs', 'formula' , .replace.lhs.singular )
# **Note:**
# This is not a replacement method, but rather a method that dispatches on the
# non-standard class '<-'. roxygen2 produces the following documentation:
#
# @usage \S4method{lhs}{`<-`}(x).
#
# But this fails for the non-standard class `<-`, so documentation is omitted.
#
#
#' @rdname formula.parts
#' @aliases `lhs<-`,<--method
setReplaceMethod( 'lhs', '<-', .replace.lhs.singular )
# -------------------------------------
# LIST AND VECTORS: expression, list
# -------------------------------------
# .replace.lhs.plural <- function( x, value ) {
#
# if( length(value) == 1 ) {
# for( i in 1:length(x) ) lhs( x[[i]] ) <- value
# } else {
# if( length(x) != length(value) )
# stop( "Cannot change the lhs. Arguments have different lengths" )
#
# for( i in 1:length(x) ) lhs(x[[i]] ) <- value[[i]]
# }
#
# x
# }
#' @rdname formula.parts
#' @aliases .replace.lhs.plural
.replace.lhs.plural <- function( x, value ) {
if( length(value) == 1 ) {
for( i in 1:length(x) ) lhs( x[[i]] ) <- value
} else if( length(x) == length(value) ) {
for( i in 1:length(x) ) lhs( x[[i]] ) <- value[[i]]
} else {
warning( "length of object != length of lhs replacement" )
}
x
}
#' @name lhs<-
#' @rdname formula.parts
#' @aliases lhs<-,expression-method
setReplaceMethod( 'lhs', c('expression','ANY') , .replace.lhs.plural )
#' @name lhs<-
#' @rdname formula.parts
#' @aliases lhs<-,list-method
setReplaceMethod( 'lhs', 'list' , .replace.lhs.plural )
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