[BioC] Situation of the legend in the plotPCA of the affycoretools library

Jordi Altirriba Gutiérrez altirriba at hotmail.com
Fri Sep 29 00:56:32 CEST 2006

Hi James,

First of all many thanks for your answer and the package!

>>I am trying to do a PCA plot with the package affycoretools, which I have 
>>found very useful!
>>I am not able to change the situation of the legend in the plot, although 
>>I have introduced the variables x.coord and y.coord in the script. Could 
>>it be a little bug or am I doing something wrong?
>No bug, just a misunderstanding. There are no arguments x.coord or y.coord 
>(actually, I don't think these are arguments for any plotting function that 
>I can think of - where did you get the idea you could pass these as 

I got this argument from the plotPCA help:


     plotPCA(eset, groups, groupnames, addtext = NULL, x.coord = NULL,
     y.coord = NULL, screeplot = FALSE, squarepca = FALSE)


x.coord: Pass an x-coordinate if automatic legend placement fails

y.coord: Pass a y-coordinate if automatic legend placement fails


Many thanks in advance,

Jordi Altirriba
PhD student
Hospital Clinic (Barcelona, Spain)

>>This is my code:
>>pd <- read.phenoData("pdata2.txt", header = TRUE, row.names = 1)
>>plotPCA(eset,groups = rep(1:2, each = 3), groupnames = 
>>I obtain exactly the same plot writing:
>>plotPCA(eset,groups = rep(1:2, each = 3), groupnames = 
>>My session:
>>Version 2.3.1 (2006-06-01)
>>attached base packages:
>>[1] "splines"   "tools"     "methods"   "stats"     "graphics"  
>>[7] "utils"     "datasets"  "base"
>>other attached packages:
>>    rat2302cdf affycoretools       GOstats      Category      hgu95av2
>>      "1.12.0"       "1.4.0"       "1.6.0"       "1.4.1"      "1.12.0"
>>          KEGG      multtest    genefilter      survival        xtable
>>      "1.12.0"      "1.10.2"      "1.10.1"        "2.28"       "1.3-2"
>>          RBGL      annotate            GO         graph         Ruuid
>>       "1.8.1"      "1.10.0"      "1.12.0"      "1.10.6"      "1.10.0"
>>         limma          affy        affyio       Biobase
>>      "2.7.10"      "1.10.0"       "1.0.0"      "1.10.1"

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