Hi, I d like to know how to convert a text file in which the first column is the probe set # (affy chips) and the other columns are signals, with a first raw having the "legends". In summary how can I transform this file into a matrix of expression levels, of gene identifiers, and a vector of class labels ? thanks Philippe [[alternate HTML version deleted]]

Have you read the Biobase vignette (Textual Description of Biobase) ? That, along with help(read.table) should describe what you need to do. Hope that helps, Deepayan On Friday 11 April 2003 10:24 pm, Phguardiol@aol.com wrote: > Hi, > I d like to know how to convert a text file in which the first column is > the probe set # (affy chips) and the other columns are signals, with a > first raw having the "legends". In summary how can I transform this file > into a matrix of expression levels, of gene identifiers, and a vector of > class labels ? thanks > Philippe

the following function will be useful: read.table as.matrix colnames rownames On Fri, 11 Apr 2003 Phguardiol@aol.com wrote: > Hi, > I d like to know how to convert a text file in which the first column is the > probe set # (affy chips) and the other columns are signals, with a first raw > having the "legends". In summary how can I transform this file into a matrix > of expression levels, of gene identifiers, and a vector of class labels ? > thanks > Philippe > > [[alternate HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > https://www.stat.math.ethz.ch/mailman/listinfo/bioconductor >