Hello, Your example is difficult to reproduce.
Please 1. use dput() to attach data 2. indicate the package(s) you used. There are at least 3 packages with a "som" function. It seems you used "RSNNS". And when I run your code, there is no "unit.classif" in "datissimi" > datissimi$unit.classif NULL Regards, Pascal On 30 January 2014 01:39, Paola Tellaroli <paola.tellar...@gmail.com> wrote: > I'm trying to compute the Silhouette value of a clustering partition done > with SOM method using the function intCriteria of the clusterCrit package but > it returns me a Nan value: somebody knows why? > > To simplify my case, here there is an example: > > < test > [,1] [,2] [,3] [,4] [,5] [,6] > [1,] 37.28577 8.902218 17.93830 38.80381 6.825286 18.44061 > [2,] 37.25598 8.693962 18.09256 38.81784 7.005092 18.17899 > [3,] 37.54612 8.262074 18.07639 38.87837 6.592799 18.31604 > [4,] 37.56661 8.651182 17.98653 38.76980 6.596529 18.46937 > [5,] 37.59454 8.546921 17.93558 39.00177 6.508707 18.40102 > [6,] 37.62195 8.422909 18.03132 38.86634 7.024104 18.30201 > [7,] 37.19365 8.662608 18.01295 38.37456 7.173594 18.24273 > [8,] 37.63161 8.495688 18.05909 38.92736 6.884675 18.44871 > [9,] 37.30077 8.488438 18.02636 38.60844 7.004214 18.45600 > [10,] 37.52518 8.610817 18.00498 38.57547 6.877532 18.36552 > > < datissimi = som(test, grid=somgrid(xdim=2, ydim=4, > topo='rectangular'), rlen=500, > keep.data=T) > >> somissimo = datissimi$unit.classif > >> intCriteria(test, somissimo, "Silhouette") > $silhouette > [1] NaN > > Thanks, > > Paola > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Pascal Oettli Project Scientist JAMSTEC Yokohama, Japan ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
