36 lines
1.1 KiB
R
36 lines
1.1 KiB
R
#' Multi-Value assigne operator.
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#'
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#' @param lhs vector of variables (or variable names) to assign values.
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#' @param rhs object that can be coersed to list of the same length as
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#' \code{lhs} storing the values of the variables defined in \code{lhs}.
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#'
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#' @details The parameter names \code{lhs} and \code{rhs} stand for "Left Hand
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#' Side" and "Right Hand Side", respectively.
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#'
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#' @examples \dontrun{
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#' c(a, b) %<-% list(1, 2)
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#' # is equivalent to
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#' ## a <- 1
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#' ## b <- 2
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#'
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#' # Switching the values of a, b could be done by.
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#' c(a, b) %<-% list(b, a)
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#' # note the usage of 'list' on the right side, otherwise an exraction of the
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#' # first two values of the concatenated object is performed. See next:
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#'
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#' # Extract values.
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#' c(d1, d2, d3) %<-% 1:10
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#' # extracting the first three valus from the vector of length 10.
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#' }
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#'
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#' @keywords internal
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"%<-%" <- function(lhs, rhs) {
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var.names <- make.names(as.list(substitute(lhs))[-1])
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values <- as.list(rhs)
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env <- parent.frame()
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for (i in seq_along(var.names)) {
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assign(var.names[i], values[[i]], envir = env)
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}
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lhs
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}
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