When I run gcrma, I get the error message: mydata.gcrma.notfast <- gcrma(mydata.raw, fast = FALSE) Computing affinities Attaching package 'matchprobes': The following object(s) are masked from package:Biobase : combine .Done. Adjusting for optical effect................................Done. Adjusting for non-specific binding.Error in bg.adjust.fullmodel(pms[, i], mms[, i], pm.affinities, mm.affinities, : couldn't find function "gcrma.bg.transformation" I am using R1.9.0beta, and gcrma 1.0.6, on windows 2000. xtable 1.2-1 mgu74av2probe 1.0 mgu74av2cdf 1.4.3 matchprobes 1.0.2 splines 1.9.0 mgu74av2 1.4.0 GO 1.4.0 KEGG 1.4.0 annaffy 1.0.6 gcrma 1.0.6 reposTools 1.3.12 Biobase 1.4.2 affy 1.4.19 methods 1.9.0 stats 1.9.0 graphics 1.9.0 utils 1.9.0 base 1.9.0 Thanks, Dick ********************************************************************** ********* Richard P. Beyer, Ph.D. University of Washington Tel.:(206) 616 7378 Env. & Occ. Health Sci. , Box 354695 Fax: (206) 685 4696 4225 Roosevelt Way NE, # 100 Seattle, WA 98105-6099 http://depts.washington.edu/ceeh/ServiceCores/FC5/FC5.html