# ZDT1 test function generator.
generateZDT1 = function(in.dim = 30L, out.dim = 2L) {
param.set = makeNumericParamSet(id = "x", len = in.dim, lower = 0, upper = 1)
paretoSet = function(n = out.dim * 100L) {
des = generateDesign(par.set = param.set, n = n)
des = des[order(des[, 1L]), ]
rownames(des) = 1:nrow(des)
mat = matrix(0, nrow = n, ncol = in.dim - 1L)
des[, -1L] = mat
des
}
paretoFront = function(n = out.dim * 100L) {
f1 = runif(n)
f2 = 1 - sqrt(f1)
des = cbind(f1, f2)
des = des[order(des[, 1L]), ]
rownames(des) = 1:nrow(des)
as.data.frame(des)
}
mooFunction(
name = "zdt1",
id = sprintf("zdt1-%id-%id", in.dim, out.dim),
fun = zdt1,
in.dim = in.dim,
out.dim = out.dim,
param.set = param.set,
paretoSet = paretoSet,
paretoFront = paretoFront)
}
# Definiton of zdt1
zdt1 = function(x) {
f1 = x[1L]
g = 1 + 9 * mean(x[-1L])
f2 = g * (1 - sqrt(f1 / g))
return(c(f1, f2))
}
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