[R] add only selected labels using thigmophobe

[joerg]

hi,

I am trying to label data points within a scatter plot using thigmophobe. 
While the data set consists of about 3000 points I only would like to label
a subset of these points. 

I read the x and y coordinates in from a txt file and define them as:

 MLPM1<-log2(Ratio.M.L.G2.PM)
 HLG2<-log2(Ratio.H.L..G2.PM)

the names and a corresponding ID are read in from the same txt file as:

GENE<-(Gene.Names)
ID<-(id)

plotting is:

plot(x=MLPM1,y=HLG2,main='G2 vs PM',xlab='Fold change M/L PM',ylab='Fold
change H/L G2)',xlim=c(-7,7),ylim=c(-7,7))

labelling of the whole dataset I can do with:

thigmophobe.labels(MLPM1,HLG2,labels=c(GENE),col=c(2:6,8:12),font=2) 

but how can I label only a few points from the whole dataset with names or
IDs ?? 

Thanks a lot for help and sorry for the simple question. Just started to use
R.

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