[BioC] PCA

[aedin culhane]

Dear Yanqin

For PCA of microarary data, have a look at ord funtion in the
bioconductor package made4. It simplified running PCA (and
correspondence analysis) on microarray data.  It takes input data in
many formats including AffyBatch, ExprSet, data.frame etc.   

To run a PCA

pca.res<- ord(data, "pca")
plot(pca.res)

Regards
Aedin