[R] R optimization and curve()?

[jcress410]

I'm trying to figure out how to plot basic utility maximization results with
R, Ideally I'd like to plot the value of u through x1,x2 space, so you can
graph income / substitution effects easily... 

also, it'd be nice if I could put a linear budget constraint on the graph

 here's an example with cobb douglas utility 

u <- function(x) {
    x1 <- x[1]
    x2 <- x[2]
 (x1^alpha)*(x2^(1-alpha))
}
utility <- function(x) x[1]^(alpha)*x[2]^(1-alpha)
p <- c(2,1)
i <- -100
alpha <- .3
umax <- function(p,i,u) {
res <- constrOptim(c(.5,.5), u, grad=NULL, ui=-p, ci=i, mu = 1e-04,
control=list(fnscale=-1))
return(res)
}
curve(umax, c(c(2,1),c(2,1)), c(10,100))
-- 
View this message in context: http://r.789695.n4.nabble.com/R-optimization-and-curve-tp2992244p2992244.html
Sent from the R help mailing list archive at Nabble.com.