Hi, I know that I can extract intensity values using the expression PM <- pm(affybatch.example)[Index,]; Is there any trick to reassigning new intensity values to the CEL file? Thanks for your help, Lana Lana Schaffer Research Specialist The Scripps Research Institute DNA Array Core Facility

No trick; just use the same pm() accessor function. new.pm <- <some vector="" or="" matrix="" of="" numbers=""> pm(affybatch.example)[index,] <- new.pm HTH, Jim James W. MacDonald Affymetrix and cDNA Microarray Core University of Michigan Cancer Center 1500 E. Medical Center Drive 7410 CCGC Ann Arbor MI 48109 734-647-5623 >>> Lana Schaffer <schaffer@scripps.edu> 12/28/04 6:11 PM >>> Hi, I know that I can extract intensity values using the expression PM <- pm(affybatch.example)[Index,]; Is there any trick to reassigning new intensity values to the CEL file? Thanks for your help, Lana Lana Schaffer Research Specialist The Scripps Research Institute DNA Array Core Facility _______________________________________________ Bioconductor mailing list Bioconductor@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/bioconductor ********************************************************** Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues.