a 2-dimensional vector specifying the location where the function is to be evaluated.
Details
The Branin-Hoo function is defined here over [0,1] x [0,1], instead of [-5,0] x [10,15] as usual.
It has 3 global minima :
x1 = c(0.9616520, 0.15); x2 = c(0.1238946, 0.8166644); x3 = c(0.5427730, 0.15)
Value
A real number equal to the Branin-Hoo function values at x
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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> library(DiceKriging)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/DiceKriging/branin.Rd_%03d_medium.png", width=480, height=480)
> ### Name: branin
> ### Title: 2D test function
> ### Aliases: branin
> ### Keywords: optimize internal
>
> ### ** Examples
>
> n.grid <- 20
> x.grid <- y.grid <- seq(0,1,length=n.grid)
> design.grid <- expand.grid(x.grid, y.grid)
> response.grid <- apply(design.grid, 1, branin)
> z.grid <- matrix(response.grid, n.grid, n.grid)
> contour(x.grid,y.grid,z.grid,40)
> x1 = c(0.9616520, 0.15); x2 = c(0.1238946, 0.8166644); x3 = c(0.5427730, 0.15)
> points(rbind(t(x1), t(x2), t(x3)), pch=19, col="red")
> title("Fonction de Branin")
>
>
>
>
>
> dev.off()
null device
1
>