"text"-function: adding text in an x,y-plot

Dear Helmut,

The problem is that you're implicitly coercing the entire data frame lab to
character, producing
as.character(lab)
[1] "c(1, 3, 4, 5, 6, 7, 8, 9, 10, 2)"

The numbers themselves come from the numeric coding of the factor V1 in this
data frame; as.numeric(lab$V1) shows you what's going on.

Instead you could specify labels=lab$V1 in the text() command. But why put
the row names in a data frame in the first place; why not simply use
labels=rownames(out.pca)?

I hope this helps,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
--------------------------------
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Helmut 
Kudrnovsky
Sent: Sunday, May 29, 2005 11:08 AM
To: r-help at stat.math.ethz.ch
Subject: [R] "text"-function: adding text in an x,y-plot

Hello R-friends,

i have a question to the "text"-function.

a little test-dataset for better understanding:

-the dataset was imported with read.table(....,header=TRUE) 
s1-s10 are the samplenames

     var1 var2 var3
s1     1    1    2
s2     2    3    1
s3     2    2    3
s4     5    4    3
s5     4    2    3
s6     6    3    2
s7     8    5    4
s8     7    2    1
s9     9    3    2
s10    8    6    4

-then i??ve performed a pincipal component analysis with prcomp

-for displaying the result in a x,y-graph i transformed 
out.pca$x into the dataframe points
  points <- out.pca$x
 > points
            PC1         PC2        PC3
s1  -4.7055777 -0.14781544 -0.3683602
s2  -3.1854599  0.19661476  1.5212455
s3  -3.2687980  0.78193513 -0.6352458
s4   0.2278948  1.00061498  0.2164108
s5  -1.4382847  0.02500633 -0.9114340
s6   0.6216283 -0.68606440  0.2071083
s7   3.4951878  1.17343675 -0.3266629
s8   1.0153619 -2.37274378  0.1978058
s9   3.3673983 -1.82145761 -0.2071739
s10  3.8706492  1.85047328  0.3063065

- with plot(points$PC1, points$PC2, type="n") i start a graph 
without displaying anything at the x,y-coordinates

- i want now to display the samplenames at the right 
x,y-coordinate;  i generated a dataframe called lab with the 
samplenames

 > lab
     V1
1   s1
2   s2
3   s3
4   s4
5   s5
6   s6
7   s7
8   s8
9   s9
10 s10

- i??ve studied the "text"-helppage and so i tried the following:

text(pca$PC1, pca$PC2, labels=lab)

- in the plot there is now c(1,3,4,5,6,7,8,9,10,2) displayed 
instead of s1-s10

is out there any idea what i'am doing wrong? is there maybe 
another way of displaying the samplenames at the right x,y-coordinate?

greetings from the sunny tirol with thanks in advance helli

platform i386-pc-mingw32
arch     i386
os       mingw32 - win xp
system   i386, mingw32
status
major    2
minor    1.0
year     2005
month    04
day      18
language R

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"text"-function: adding text in an x,y-plot

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