##' @description
##' \code{runif_design} generates a design based on random samples from a multivariate uniform distribution.
##' @rdname design
##' @return
##' \code{runif_design} returns a data frame with \code{nseq} rows and one column for each variable named in \code{lower} and \code{upper}.
##'
##' @export
runif_design <- function (lower = numeric(0), upper = numeric(0), nseq) {
if (length(lower)!=length(upper))
pStop(sQuote("lower")," and ",sQuote("upper")," must have same length.")
lnames <- names(lower)
if (is.null(lnames))
pStop(sQuote("lower")," and ",sQuote("upper")," must be named vectors.")
if (!all(sort(lnames)==sort(names(upper))))
pStop("names of ",sQuote("lower")," and ",sQuote("upper")," must match.")
upper <- upper[lnames]
if (!all(upper>=lower))
pStop("upper values should be at least as large as lower ones.")
nseq <- as.integer(nseq)
if (nseq < 0)
pStop(sQuote("nseq"),"< 0.")
y <- matrix(
data=runif(n=nseq*length(lower),min=lower,max=upper),
nrow=nseq,ncol=length(lower),
byrow=TRUE
)
colnames(y) <- lnames
as.data.frame(y)
}
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