Message-ID: <Pine.LNX.4.31.0202060757120.22944-100000@gannet.stats>
Date: 2002-02-06T08:00:20Z
From: Brian Ripley
Subject: passing parameters in optim()
In-Reply-To: <3C605635.229F3E28@noaa.gov>
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
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