[R] adding labels to x,y points

[Weidong Gu]

A sample data would help. But you could modify as

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

HTH

Weidong Gu


On Tue, Sep 20, 2011 at 7:43 PM, baumeist <mark.baumeister7 at gmail.com> wrote:
> Hi,
> I am new to R.
>
> I have a matrix that I have assigned to the object “colon”.
>
>> colon<-read.table("c:\\alon.txt",header=T,row.names=1)
>
> attach(colon)
> names(colon)
>
> The dimenstions are 2000   62.
>
> 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) using the code (not sure if I did this right):
>
>> 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
>
>
> --
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