#' Generate a number of samples according to the ranges in the problem spec
#'
#' Currently generates samples based on Sobol sequences
#'
#' @param ps The \code{ProblemSpec} containing the dim names and the ranges
#' @param n How many samples to generate
#' @return A data frame with \code{n} rows for each dimension
sample.ProblemSpec = function(ps, n) {
d = length(ps$dimNames)
x = data.frame(randtoolbox::sobol(n, d))
# set up the data frame
names(x) = ps$dimNames
for(dn in ps$dimNames) {
r = ps$limits[[dn]]
# scale the values to the limits of the dimension
x[,dn] = r[1] + (r[2] - r[1]) * x[,dn]
}
x
}
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