Dear Benilton Yes, but the error disappears only when I define it twice.
For my package I create three files: 1. MyClasses.R: Here I define the classes only using setClass("baseClass") setClass("derivedClass") 2. methods.baseClass.R Here I define the methods for baseClass setGeneric("export", function(object,...) standardGeneric("export")) setMethod("export", "baseClass", export.baseClass); 3. methods.derivedClass.R Here I define the methods for derivedClass setGeneric("export", function(object,...) standardGeneric("export")) setMethod("export", "derivedClass", export.derivedClass); As you see, I need to define setGeneric twice, otherwise I get the error. It is not clear to me, why this is the case? I know, that BioBase has a file AllGeneric.R, but I would like to define the generics in the respective methods files. Best regards Christian Benilton Carvalho wrote: > do you have a generic for 'export'? > > On Mar 16, 2007, at 5:38 PM, cstrato wrote: > >> Dear Benilton >> >> Thank you, now my package works. >> >> Do you have an explanation for my second problem: >> >> * Installing *source* package 'mytest' ... >> ** R >> ** save image >> Error in setMethod("export", "derivedClass", export.derivedClass) : >> no existing definition for function "export" >> Error: unable to load R code in package 'mytest' >> Execution halted >> >> What may be the reason for this error? >> >> Best regards >> Christian >> >> ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel