[R] Optimization

[livia]

It is of great help for your advice. Thanks a lot to you all.

livia wrote:
> 
> Hi, I would like to minimize the value of x1-x2, x2 is a fixed value of
> 0.01, x1 is the quantile of normal distribution (0.0032,x) with
> probability of 0.7, and the changing value should be x. Initial value for
> x is 0.0207. I am using the following codes, but it does not work.
> 
> fr <- function(x) {
>       x1<-qnorm(0.7,0.0032,x)
>       x2=0.01
>       x1-x2
> }
> xsd <- optim(0.0207, fr, NULL,method="BFGS")
> 
> It is the first time I am trying to use optimization. Could anyone give me
> some advice?
> 

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