?try is your friend here. On Sat, 21 Jun 2003, Jonck van der Kogel wrote:
> Hi all, > I am momentarily experimenting with Silhouette from the cluster library > but I am getting some errors. Since Silhouette can be seen as a quality > measure for a clustering what I want to do is run a series of different > clusterings and store the one with the highest Silhouette value. In > that way I hope to get "the best" clustering possible for my dataset. > Here is the problem: > When running the examples that come with silhouette, everything works > fine, the silhouette values are calculated perfectly. When I try to run > silhouette with my own dataset I get errors at unpredictable times, > that is, sometimes silhouette runs succesfully and at other times it > gives me the following error: > > test <- silhouette(cutree(agn, k=5), daisy(bestSom$codes)) > Error in apply(dmatrix[!iC, iC], 2, function(r) tapply(r, x[!iC], > mean)) : > dim(X) must have a positive length > > Since I am running my experiments in batch mode (put a loop of > experiments in a source file and then load this source file), whenever > this error occurs the entire experiment is cut off. The experiment > takes rather a long time (approx. 12 hours), so I would not want to > start my experiment at night only to find in the morning that my > experiment never ran. Is there a way to > a) prevent the error from happening, or > b) detect beforehand that the error will happen and thus not do the > silhouette calculation for that particular clustering > > Any help with this is much appreciated, > thanks, Jonck > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
