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#' Define a collection of multivariate polynomials.
#'
#' Combine a series of mpoly objects into a mpolyList.
#'
#' @param ... a series of mpoly objects.
#' @return An object of class mpolyList.
#' @export
#' @examples
#' ( p1 <- mp("t^4 - x") )
#' ( p2 <- mp("t^3 - y") )
#' ( p3 <- mp("t^2 - z") )
#' ( ms <- mpolyList(p1, p2, p3) )
#' is.mpolyList( ms )
#'
#' mpolyList(mp("x + 1"))
#' p <- mp("x + 1")
#' mpolyList(p)
#'
#' ps <- mp(c("x + 1", "y + 2"))
#' is.mpolyList(ps)
#'
#'
#' f <- function(){
#' a <- mp("1")
#' mpolyList(a)
#' }
#' f()
#'
#'
mpolyList <- function(...){
arguments <- as.list(match.call()[-1])
out <- lapply(arguments, eval, parent.frame(1))
# if(is.mpoly(out)) out <- list(out)
if(!all(vapply(out, is.mpoly, logical(1)))){
stop("Each argument must be of class mpoly.", call. = FALSE)
}
class(out) <- "mpolyList"
out
}
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