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## t e s t f u n c t i o n s . R Test Functions
##
rastrigin <- function(x) {
n <- length(x)
10*n + sum(x^2 - 10*cos(2*pi*x))
}
rosenbrock <- function(x) {
n <- length(x)
x1 <- x[2:n]
x2 <- x[1:(n-1)]
sum(100*(x1-x2^2)^2 + (1-x2)^2)
}