[BioC] Boxplot from dataframe...

[James W. MacDonald]

David Ruau wrote:
> 
> I found out finally how to have the names of the experiments printed on 
> the x axis by using the phenoData define in the affyBatch.
> ###
> boxplot(exprs(abatch)[rownames(exprs(abatch))==id] ~ abatch$population, 
> col=colors, axes=FALSE)
> title(main=y, sub=id)
> axis(1, at = 1:length(unique(da.gcrma$population)), labels = 
> as.list(unique(da.gcrma$exp)))
> axis(2)
> box()
> ###
> 
> David

Why don't you just use the 'names' argument to boxplot() for the x-axis 
labeling? In addition, you don't need the logical vector

rownames(exprs(abatch))==id

to subset a matrix. You can simply use the rowname, which is at the very 
least less typing, and may well be faster.

exprs(abatch)[id,]

Jim



-- 
James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623