Respected Sir/ Madam,
We the students of M.Sc.(BIOINFORMATICS), C.S.J.M. University, Kanpur (U.P), 
INDIA are encountering some problems regarding transcriptomic analysis of iron 
and phosphorus 

interaction in rice seedlings  while using R-Package(2.12.2). We are using 
following commands for simpleaffy package:-
library(simpleaffy);
raw.data <- read.affy("covdesc.txt");
x.rma <- call.exprs(raw.data, "rma");
What are covdesc.txt file?
How to create & where to save this covdesc.txt file for "transcriptomic analysis 
of iron and phosphorus interaction in rice seedlings" in 
Bioconductor(R-package)?
We shall be highly obliged to you.
Thanking you.
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