Hi Robert, Thank you for your response. It works when I explicitly using double type integers. >library("genefilter") >mt1<-matrix(seq(1.0,12.0,1.0),nrow=3) >rowQ(mt1,2) 4 5 6 Thanks. -ZRL On Sun, Jul 26, 2009 at 4:37 PM, Robert Gentleman wrote: > looks like a bug-let, > the problem is that you have an integer matrix, and rowQ wants it to be > double (but rowQ should convert internally if this is the case) > > mt=matrix(1:12+0, nrow=3) > rowQ(mt, 2) > > works just fine > > also, please do follow the posting guide and provide a complete example > (including all calls to library etc) and the output of sessionInfo, > > thanks > > zrl wrote: > >> Dear list, >> >> I tried to use rowQ to do some test, however, it failed. >> >> ">mt<-matrix(1:12,nrow=3) >> >>> rowQ(mt,2) >>> >> Error in rowQ(mt, 2) : 'imat' must be a numeric matrix" >> >> however, in the manual page of "rowQ": >> >> Usage: >> >> rowQ(imat, which) >> rowMax(imat) >> rowMin(imat) >> >> Arguments: >> >> imat: Either a matrix or an 'ExpressionSet'. >> >> which: An integer indicating which order statistic should be >> returned." >> >> It seems that imat could be a matrix, but why when I used matrix, it >> reported error? >> Thanks. >> >> -ZRL >> >> [[alternative HTML version deleted]] >> >> _______________________________________________ >> Bioconductor mailing list >> Bioconductor@stat.math.ethz.ch >> https://stat.ethz.ch/mailman/listinfo/bioconductor >> Search the archives: >> http://news.gmane.org/gmane.science.biology.informatics.conductor >> >> > -- > Robert Gentleman, PhD > Program in Computational Biology > Division of Public Health Sciences > Fred Hutchinson Cancer Research Center > 1100 Fairview Ave. N, M1-B514 > PO Box 19024 > Seattle, Washington 98109-1024 > 206-667-7700 > rgentlem@fhcrc.org > [[alternative HTML version deleted]]