Hi,
1.) The "median" function does not work well. Please refer to the data below (same data is attached as txt-delimited). This is what I try to do in R: median ( dataf [2:9] ) I get warning: "needs numeric data" 2.) BUT if apply the median to a single vector: median ( dataf [,2]] ) then it works: 3.) How come the "median" function does not let me take the median of all 8 vectors at once? Obviously, if I can perform the test on a single array, then it means I have numeric data because I do not get warning. Also, if I look at the "mode" for each array I get "numeric". Probe 1 256 589 308 698 745 850 750 1200 Probe 2 225 422 350 625 400 650 852 1400 Probe 3 295 530 325 585 350 700 752 1100 Probe 4 300 450 425 430 700 645 735 1250 Thanks in advance, Alexi Zubiria Technical Support Specialist Silicon Genetics 2601 Spring Street Redwood City CA, 94063 Main: 650-367-9600 Support: 866-744-7638 [EMAIL PROTECTED] [[alternative HTML version deleted]] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html