Nothing
factDesign <- function (dimension, levels) {
if (length(levels) == 1) {
levels <- rep(levels, dimension)
}
else if (length(levels) != dimension) {
stop("argument 'levels' must be of length 1 or 'dimension'")
}
x <- matrix(0, prod(levels), dimension)
for (i in 1:dimension) {
xi <- 1
for (j in (1:dimension)[(1:dimension) < i]) {
xi <- xi %x% rep(1, levels[j])
}
xi <- xi %x% seq(0, 1, length.out = levels[i])
for (j in (1:dimension)[(1:dimension) > i]) {
xi <- xi %x% rep(1, levels[j])
}
x[, i] <- xi
}
n <- dim(x)[1]
return(list(design = x, n = n, dimension = dimension, levels = levels))
}
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