passing parameters in optim()
On Tue, 5 Feb 2002, Nancy Lo wrote:
Hi all, I am using optim() to get estimate for parameter 'a' which will minimize the output of lprob.catch(a) and I got an error message:
optim(2,lprob.catch(x, freq,1, 0.5,0.5, a,- 0.7, 1, -0.7,0.1,
1,0.2,2,1,data.sf.mont))
Error in catch2.fun(k, f1, f2, a, b, A, B, R, n0, av, index.n) :
Object "a" not found
Why wasn't the initial value of a=2 passed to catch2.fun() which was
called by lprob.catch()?
From ?optim
fn: A function to be minimized (or maximized), with first
argument the vector of parameters over which minimization is
to take place. It should return a scalar result.
and a is not the first argument: you told it to optimze over x.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._