[R] Memory leak in R v1.5.1? (how to use optim)

Huntsinger, Reid
2002-08-06T16:56:33Z

You need to have the variables over which you want to minimize
passed as a single argument (the first). Try

silly.fn <- function(params) ( (params[1] - 5)^2 + (params[2] - 2)^2 )

Reid Huntsinger

-----Original Message-----
From: Adaikalavan Ramasamy [mailto:ramasamy at stats.ox.ac.uk]
Sent: Tuesday, August 06, 2002 12:26 PM
To: R-help at stat.math.ethz.ch
Cc: stone at stats.ox.ac.uk
Subject: Re: [R] Memory leak in R v1.5.1?


Hi ! I am trying to minimise a function over 2 variables simultaneously. Is
this possible ? I have only recently been introduced to optim() and
optimise() function. Here is simple example of what I tried to do :

silly.fn <- function(x,y) { (x-5)^2 + (y-2)^2 }
optim( par=c(3,1) , silly.fn )

Analytically, the answer should be (5,2) but the computer is asking for the
y value. Is there a function to do the minimisation simultaneously in S-PLUS
or R ?

Many thanks, Adai.

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