This tutorial shows how to download some public Affymetrix microarray data, load the data into R, calculate expression values and do some very simple plotting
Working with Affymetrix CEL files in R
http://www.ark-genomics.org/events-online-training/working-affymetrix-cel-files
http://www.ark-genomics.org/events-online-training/working-affymetrix-cel-files
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