From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>

Date: Tue 14 Sep 2004 - 02:58:53 EST

Date: Tue 14 Sep 2004 - 02:58:53 EST

We are currently on R 2.0.0 alpha. If you submit a bug fix, preferably
this week and at the latest next week, it will be considered for 2.0.0.

Please take seriously that R is an open project and does not have `staff' to fix bugs. If you think it is worth fixing, please fix it for us by providing a complete analysis and fixes for all the possible options that might be affected.

The best place for a patch to be sent is R-bugs.

On Mon, 13 Sep 2004, Daniel Hoppe wrote:

*> Hi!
**>
*

> This is a repost of an earlier message (with a clearer example

*> demonstrating the problem I ran into). If you run the mle example in
**> stats4
**>
**> library(stats4)
**> x <- 0:10
**> y <- c(26, 17, 13, 12, 20, 5, 9, 8, 5, 4, 8)
**> ll <- function(ymax=15, xhalf=6)
**> -sum(stats::dpois(y, lambda=ymax/(1+x/xhalf), log=TRUE))
**> (fit <- mle(ll))
**> plot(profile(fit), absVal=FALSE)
**>
**> everything works fine. Now run
**>
**> (fit <- mle(ll, method="BFGS", control=list(ndeps=c(1e-3, 1e-3))))**
**> plot(profile(fit), absVal=FALSE)
**>
**> and you will get
**>
**> Error in interpSpline.default(obj[[i]]$par.vals[, i], obj[[i]]$z,
**> na.action = na.omit) :
**> only 0's may mix with negative subscripts
**>
**> This happens because optim gets the old ndeps but just one variable to
**> optimize. The optim error is not reported, so the problem is rather hard
**> to trace. Would you agree that this would be worth fixing?
**>
**> Best regards,
**>
**> Daniel
**>
**> (original posting with quick workaround
**> **http://tolstoy.newcastle.edu.au/R/help/04/07/1778.html)
**>
**> --
**> Daniel Hoppe
**> Department of Marketing
**> University of Vienna
**> Bruenner Strasse 72
**> 1210 Vienna
**> Austria
**>
**> ______________________________________________
**> R-devel@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-devel
**>
**>
*

-- Brian D. Ripley, ripley@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 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-develReceived on Tue Sep 14 03:07:07 2004

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