Hi Paul, "H. Paul Benton" <[EMAIL PROTECTED]> writes: > I consider myself pretty new to the whole OO based programming so > I'm sorry if I'm doing something stupid.
These sorts of questions might be better sent to the R-devel list... >> xml<-read.metlin(url) > Error in function (classes, fdef, mtable) : > unable to find an inherited method for function "read.metlin", > for signature "url" So the error message is telling you that it can't find a method for the read.metlin generic that matches the class of the xml argument you passed in. You defined: > setMethod("read.metlin", "xcmsRaw", function(xml) { > #Parsing the METLIN XML File > reading<-readLines(xml) > # do rest of script > > }) So there is a method for read.metlin when the xml argument is an xcmsRaw object. As you show, you passed in an object with class "url". >> url > description > "http://metlin.scripps.edu/download/MSMS_test.XML" > class > "url" > Any help as to why I'm getting the inherited method error would be > great. You either need to add a method specialized on the url class (warning, url is not an S4 class, there will be tricks required). Or you need to pass in an xcmsRaw object. Cheers, + seth -- Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center BioC: http://bioconductor.org/ Blog: http://userprimary.net/user/ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.