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## Ackley
tfAckley <- function(x) {
n <- length(x)
20 + exp(1) - 20 * exp(-0.2*sqrt(x %*% x /n)) - exp(sum(cos(2*pi*x))/n)
}
## tfGriewank
tfGriewank <- function(x) {
n <- length(x)
x %*% x / 4000 - prod(cos(x / sqrt(1L:n))) + 1
}
##tfRastrigin
tfRastrigin <- function(x) {
n <- length(x)
10*n + sum(x^2 - 10 * cos(2*pi*x))
}
## Rosenbrock
tfRosenbrock <- function(x) {
n <- length(x)
xi <- x[seq_len(n-1L)]
sum(100 * (x[2L:n] - xi * xi)^2 + (1 - xi)^2)
}
## tfSchwefel
tfSchwefel <- function(x)
sum(-x * sin(sqrt(abs(x))))
## Trefethen
tfTrefethen <- function(x) {
y <- x[2L]
x <- x[1L]
exp(sin(50*x)) + sin(60*exp(y)) + sin(70*sin(x)) +
sin(sin(80*y)) - sin(10*(x+y)) + (x^2+y^2)/4
}
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