adding labels to x,y points

Hi,
I am new to R.

I have a dataframe that I have assigned to the object “colon”.

> colon<-read.table("c:\\alon.txt",header=T,row.names=1)

attach(colon)
names(colon)

It (i.e. colon) consists of 62 different columns (samples) or sets of data.

Each of the 62 columns (titled norm1, norm2, norm3, etc) has 2000
different numbers (‘continuous’ values) within it.

I have also assigned a name for each of the 2000 rows of the dataframe with a prefix (i.e. g1 …. g2000).

> colon<-paste("g",c(1:nrow(colon)),sep="")

I have plotted the first 20 values from two of the columns(samples).

> x<-c(norm1[1:20])

> y<-c(norm2[1:20])

> plot(x,y,type='n',xlab='x norm1 sample',ylab='y norm2 sample',main='Norm1 vs Norm2 - 20
genes')

> points(x,y,pch=15,col='blue')

Now I wish to assign labels to each point (above each point (i.e. pos=3) in the plot with “g1 to g20 corresponding to each row but I am having trouble with this step.

I have tried:

> text(x,y, label = row.names(colon[1:20]))

but nothing happens.

Any suggestions?

Thanks in advance
MAB