[BioC] Class Library Problem

[Moore, Stephen]

Dear all,

We have been investigating various ways of carrying out supervised clustering analysis in R.  We have been  working through the 'machine learning lab' manual and under the section of k nearest neighbours, there are example commands as shown below:

> library(class)
> knn1<-knn(t(expres(trainSet)),t(exprs(testSet)),trainY,k=1)

When we type these commands within R we get the following error message:

"Error in t(expres(trainSet)) : couldn't find function "expres"."

Is this a case of example commands and that the datasets to which it is referring do not actually exist or is there a problem on our part.  Does anyone know of examples that have datasets that we can practice on?

For reference we are using R version 1.9.0 and the library CLASS is the latest release.

Many Thanks for your time and help.

Stephen Moore

Dr. Stephen Moore
Senior Scientist
ArraGen Ltd.
Almac House
Seagoe Industrial Estate
Craigavon
Co. Armagh
BT63 5QD
Northern Ireland
E-mail:Stephen.Moore at arragen.com
Phone: 02838 395751
Mobile: 07719 989348
Fax:     02838 398676




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