if I have a vector, I can find the indexes which satisfy a condition: x <- rnorm(10) [1] 0.4751132 -0.5442322 -0.1979854 -0.2455521 0.8349336 -0.4283345 [7] 0.6108130 2.0576160 1.1251716 -1.3933637 x[x>0] [1] 0.4751132 0.8349336 0.6108130 2.0576160 1.1251716 (1:10)[x>0] [1] 1 5 7 8 9
how about a matrix? 00000G 00000Q 00002O 000035 000037 00003A 00000G NA 0.008226002 0.005631718 0.0002625585 0.0010673235 0.0045310915 00000Q NA NA 0.003714951 0.0002007877 0.0016983426 0.0011083925 00002O NA NA NA 0.0024233691 0.0069849678 0.0024510792 000035 NA NA NA NA 0.0006499707 0.0008420414 000037 NA NA NA NA NA 0.0005448872 00003A NA NA NA NA NA NA 00003B NA NA NA NA NA NA 00003G NA NA NA NA NA NA 00003H NA NA NA NA NA NA 00003I NA NA NA NA NA NA 00003B 00003G 00003H 00003I 00000G 0.0007254316 0.0093954826 3.420231e-04 0.003974556 00000Q 0.0013883606 0.0019778247 3.609791e-05 0.001552725 00002O 0.0027340806 0.0082790646 2.561862e-03 0.012297821 000035 0.0006025767 0.0004534397 1.053946e-03 0.001681780 000037 0.0005501974 0.0021137871 1.733880e-03 0.003712675 00003A 0.0008969849 0.0043855527 2.786194e-06 0.002492954 00003B NA 0.0019791290 8.301787e-04 0.002816774 00003G NA NA 3.181892e-07 0.010608717 00003H NA NA NA 0.001066141 00003I NA NA NA NA how do I find the cells whose values are, e.g., > 0.01 ?? thanks! -- Sam Steingold (http://sds.podval.org/) on Ubuntu 11.10 (oneiric) X 11.0.11004000 http://www.childpsy.net/ http://pmw.org.il http://americancensorship.org http://ffii.org http://iris.org.il http://truepeace.org http://dhimmi.com The difference between genius and stupidity is that genius has its limits. ______________________________________________ R-help@r-project.org 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.