#' VU1 test function generator.
#'
#' @param in.dim [\code{integer(1)}] \cr
#' Size of parameter space. Must be two.
#' @param out.dim [\code{integer(1)}] \cr
#' Size of target space. Must be two.
#' @return A \code{mooFunction}.
#'
#' @references
#' wfg [64]
#'
#' @aliases vu1 VU1
generateVU1 = function(in.dim = 2L, out.dim = 2L) {
in.dim = asCount(in.dim)
out.dim = asCount(out.dim)
if (in.dim != 2L)
stop("VU1 supports only in.dim = 2.")
if (out.dim != 2L)
stop("VU1 supports only out.dim = 2.")
param.set = makeNumericParamSet(id = "x", len = in.dim, lower = -3, upper = 3)
paretoSet = NULL
paretoFront = NULL
mooFunction(
name = "vu1",
id = sprintf("vu1-%id-%id", in.dim, out.dim),
fun = vu1,
in.dim = in.dim,
out.dim = out.dim,
param.set = param.set,
paretoSet = paretoSet,
paretoFront = paretoFront)
}
# Definiton of vu1
vu1 = function(x) {
f1 = 1 / (sum(x^2) + 1)
f2 = x[1L]^2 + 3 * x[2L]^2 + 1
return(c(f1, f2))
}
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