Hi there, I tried: >sam.out <- sam(golub, golub.cl, rand = 123, gene.names = golub.gnames[,3] >write(sam.out,file=”data.txt”) I got the file data.txt with nothing there. And the same problem happened when I tried to output summary(sam.out). Similar problem: Once I got result sum.sam.out$mat.sig, how could output it to a excel file, which has seven separate columns? I have checked all the above results class are character. Again, still couldn't figure out how to output them to excel file. Thanks for all advises! Yanqin --------------------------------- Meet the all-new My Yahoo! – Try it today! [[alternative HTML version deleted]]