Dear Bioconductor Staff: I'm having a problem in reading yeast microarray data by R & Bioconductor. The error message is "The file xxx.CEL does not appear to be a CEL file." I have downloaded the yeast cdf package (ygs98cdf_0.1.zip) and installed it using the "install package" function from R menu. A possible problem with the data is that they were produced a long time ago (in the years of 1997 and 1998) so I wonder if a different cdf file is needed to interpret them. Could you please diagnose the problem and advise on the solution? Thank you. Best regards, Lei

On Thu, Jan 23, 2003 at 03:34:16PM -0800, Lei Zhuge wrote: > > Dear Bioconductor Staff: > > I'm having a problem in reading yeast microarray data by R & Bioconductor. > The error message is "The file xxx.CEL does not appear to be a CEL file." > I have downloaded the yeast cdf package (ygs98cdf_0.1.zip) and installed > it using the "install package" function from R menu. A possible problem > with the data is that they were produced a long time ago (in the years of > 1997 and 1998) so I wonder if a different cdf file is needed to interpret > them. Could you please diagnose the problem and advise on the solution? >From here, it looks like your CEL files are somehow strange. All the files I have seen start with a line like '[CEL]' (that's what the parser is checking and complains about). For further help, you may have to send one file (or at least its first line). (note: if your CEL files are compressed and the parameter 'compress' is set to FALSE, you'd get theis error message too). Hopin' it helps, Laurent > > Thank you. > > Best regards, > > Lei > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > http://www.stat.math.ethz.ch/mailman/listinfo/bioconductor -- -------------------------------------------------------------- currently at the National Yang-Ming University in Taipei, Taiwan -------------------------------------------------------------- Laurent Gautier CBS, Building 208, DTU PhD. Student DK-2800 Lyngby,Denmark tel: +45 45 25 24 89 http://www.cbs.dtu.dk/laurent