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Hi Marco, marco fabbri wrote: > As a results of limma analysis I got a list of affy probesets. > After annotation some probets point to the same gene symbol. > I would like to produce an R script that remove duplicate, and for duplicate > keep only the probests with the larger A. > > To be clearer I have a table as the one below and I would like to remove the > probe 2000_at because the symbol ccl5 is present twice and for the duplicate > I remove 2000_at because A (1.5) is smaller than the 2003_at A 5.25. > > Symbol Probe chip1 chp2 A > ccl5 2000_at 1.2 1.3 1.25 > ccl2 2001_at 1.2 1.3 1.25 > ccl5 2003_at 5.2 5.3 5.25 See ?findLargest in the Category package. Best, Jim -- James W. MacDonald, M.S. Biostatistician Affymetrix and cDNA Microarray Core University of Michigan Cancer Center 1500 E. Medical Center Drive 7410 CCGC Ann Arbor MI 48109 734-647-5623 ********************************************************** Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues.