[R] Solving equations with optim

[ianfiske]

If you want to find the value of x such that f(x) = 0, then you can minimize
f^2 or abs(f) using optim.  Hope this helps,

Ian



francogrex wrote:
> 
> Hello, optim searches for min (or max) of a function, but is it possible
> to solve for a specific value? I mean, I want to find the value of a and b
> that give the function value closest to ZERO (and not min or max) in the
> below. is it possible? thanks
> 
> test=function(x){
> a=x[1]
> b=x[2]
> if (all(x>0))(((a/(a+b))*(beta(a,b)/(beta(a,b)-beta(a,b+6))))-0.35259)
> else Inf
> }
> optim(c(1,2),test)
> 
> 

-- 
View this message in context: http://www.nabble.com/Solving-equations-with-optim-tp16070263p16070698.html
Sent from the R help mailing list archive at Nabble.com.