2006/1/30, Ionut Florescu <[EMAIL PROTECTED]>: > > I don't know about rownames but > x >= 0 gives you a vector of logical values True and false. > If then you do > c(1:length(x)) [x>=0] > this gives the positions where the true happened, meaning your vector of > values.
But also returns NA's, if present in 'X'. If you're really interested in indices of matched condition, consider using 'which': which(mydata$X>=0) Anyway, if you're really interested in rownames instead of numerical indices, you have various options. For example: rownames(mydata)[which(mydata$X>=0)] or, more compactly, as Chuck Cleland has suggested: rownames(subset(mydata, X >=0)) Antonio, Fabio Di Narzo. > Chuck Cleland wrote: > > rownames(subset(mydata, X >=0)) > > > > ?rownames > > > > Leaf Sun wrote: > > > >> Hi R-listers, > >> > >> I have a simple question about a data frame. > >> > >> I sorted a data set by one of the variable in some condition (eg. > X>=0), the followed is part of the achieved. I was wondering how can I get > the row name, i. e. (1202, 2077 , 2328, 3341,... ) and save them as a > vector. Thanks! > >> > >> Tag Species X Y Dbh3 Recr4 mort slope > elevation aspect SA SR dist1 dist2 dist3 > >> 1202 19103 316 856.0 430.3 21 4 1 9.87 151.42 > 60.08 25.38 1.02 0.2236068 0.7211103 1.3601471 > >> 2077 29893 316 935.4 482.7 28 4 1 5.66 137.28 > 13.86 25.14 1.01 0.6403124 0.8944272 1.0630146 > >> 2328 32989 316 910.7 301.5 12 4 1 8.07 137.69 > 86.16 25.26 1.01 0.3000000 1.2806248 1.3038405 > >> 3341 45198 316 975.2 2.4 144 4 1 2.95 121.10 > 173.60 0.00 0.00 0.5656854 1.2727922 1.3416408 > >> ... > >> > >> Regards, > >> > >> Leaf > >> > >> > >> > >> > ------------------------------------------------------------------------ > >> > >> ______________________________________________ > >> [email protected] mailing list > >> https://stat.ethz.ch/mailman/listinfo/r-help > >> PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > >> > > > > > > ------------------------------------------------------------------------ > > > > ______________________________________________ > > [email protected] mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
