Hi I am very new to R. I am trying to normalize 4 sample sets of CEL data generated by using Tiling array. I think I have loaded all required packages but when I call normalize.quantiles function in R, I get an error message : Error: could not find function "normalize.quantiles". Can somebody please help. - R. Ambatipudi [[alternative HTML version deleted]]

Hi Radhika, On Jun 30, 2009, at 5:34 PM, Radhika Ambatipudi wrote: > Hi > > I am very new to R. I am trying to normalize 4 sample sets of CEL data > generated by using Tiling array. I think I have loaded all required > packages > but when I call normalize.quantiles function in R, I get an error > message : > Error: could not find function "normalize.quantiles". Can somebody > please > help. The "normalize.quantiles" function is in the preprocessCore library, which needs to be loaded first, like so: ===== R> library(preprocessCore) R> ... R> ny.data.qq <- normalize.quantioes(my.data) ===== Since you're new to R, one way you could have discovered this is by using the "help.search" function, eg: ===== R> help.search('normalize.quantiles') Help files with alias or concept or title matching ?normalize.quantiles? using regular expression matching: preprocessCore::normalize.quantiles Quantile Normalization preprocessCore::normalize.quantiles.in.blocks Quantile Normalization carried out separately within blocks of rows preprocessCore::normalize.quantiles.robust Robust Quantile Normalization preprocessCore::normalize.quantiles.use.target Quantile Normalization using a specified target distribution vector Type '?PKG::FOO' to inspect entry 'PKG::FOO TITLE'. ===== Hope that helps, -steve -- Steve Lianoglou Graduate Student: Physiology, Biophysics and Systems Biology Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact