Hi, I have a question to a function in the library affy. One is able to read in Microarray data with this function. The output is an object which has this raw data. I remember that I could see this data with affy at exprs when affy is this object. But it is not available, that means there is no extension @exprs. Does anybody know why. Thank you very much in advance! Michael

Hi Michael, Michael Dannemann wrote: > Hi, > > I have a question to a function in the library affy. One is able to read > in Microarray data with this function. The output is an object which has > this raw data. I remember that I could see this data with affy at exprs > when affy is this object. But it is not available, that means there is > no extension @exprs. Does anybody know why. Thank you very much in advance! You should not use slot accessors directly - for most packages that use S4 methods (affy being one of them), there are accessors designed to allow you to get the data you want without having to know the underlying structure of the object you are querying. In this case, the exprs() accessor has always returned the raw data, and will continue to do so, regardless of any changes that may happen with the underlying data structure. Best, Jim > > Michael > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor -- James W. MacDonald University of Michigan Affymetrix and cDNA Microarray Core 1500 E Medical Center Drive 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.

Michael, ReadAffy returns an AffyBatch object. Have you tried exprs(ab) where ab is an AffyBatch object? Mark On 01/06/2007, at 10:19 PM, Michael Dannemann wrote: > Hi, > > I have a question to a function in the library affy. One is able to > read > in Microarray data with this function. The output is an object > which has > this raw data. I remember that I could see this data with affy at exprs > when affy is this object. But it is not available, that means there is > no extension @exprs. Does anybody know why. Thank you very much in > advance! > > Michael > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/ > gmane.science.biology.informatics.conductor