select cases from a data.frame or matrix
"Till Baumgaertel" <till.baumgaertel at epost.de> writes:
hi all, is there a better solution to select rows from a data.frame than by iterating through the whole set and evaluating every case one by one? is there maybe something like: d <- data.frame(...) maleOver40 <- select.data.frame( d, "( sex=m or sex=M) and age > 40)") of course, i could use direct database-requests, but this would require my data to be stored in a database... thank you, till
subset(d, sex %in% c("m","M") & age > 40)
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._