Try this: q <- z[match(p, y)]
Jean `·.,, ><(((º> `·.,, ><(((º> `·.,, ><(((º> Jean V. Adams Statistician U.S. Geological Survey Great Lakes Science Center 223 East Steinfest Road Antigo, WI 54409 USA 715-627-4317, ext. 3125 (Office) 715-216-8014 (Cell) 715-623-6773 (FAX) http://www.glsc.usgs.gov (GLSC web site) http://profile.usgs.gov/jvadams (My homepage) jvad...@usgs.gov (E-mail) From: testrider <testri...@gmail.com> To: r-help@r-project.org Date: 08/04/2011 07:21 AM Subject: [R] R loop problem Sent by: r-help-boun...@r-project.org I have run into a speed issue, and given the size of the problem it feels like there should be an easy solution. Here is the problem statement with some arbitrary numbers added. #p,q: vector with length(q)==length(p)==10000 and length(levels(p))==3000 #y,z: vectors with length(levels(y))=length(y)==length(z)==5000 for (i in levels(p)){ q[i==p]<-z[i==y]} At first i used two for loops which was horrible, now i got rid of one but i don't know how to lose the second one. PS. I expect the solution to be available through google etc and I have searched for a solution but i did not find any usefull websites, probably because i cannot pinpoint the best search words. -- View this message in context: http://r.789695.n4.nabble.com/R-loop-problem-tp3718103p3718103.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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. [[alternative HTML version deleted]]
______________________________________________ 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.
