Nothing

```
ackley <- function(x)
{
x1 <- x[,1]
x2 <- x[,2]
a <- 20
b <- 0.2
c <- 2*pi
i <- 1:2
dx <- 2
y <- -a*exp(-b*sqrt(1/dx*(x1^2+x2^2)))-exp(1/dx*(cos(c*x1)+cos(c*x2)))+a+exp(1)
y <- matrix(y,nrow=nrow(x))
rownames(y) <- rownames(x)
colnames(y) <- paste("y",seq(1,ncol(y)),sep="")
return(y)
}
```

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