[R] Optimization

[livia]

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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