Hi #Create data and data frames x=rnorm(5,0,1) y=rnorm(5,0,1) z=rnorm(5,0,1) d1=data.frame(x,y) d2=data.frame(y,z)
#which variable name in d2 is a variable name in d1? names(d2[names(d2)%in%names(d1)]) # it's y #give me the columns of d2 that have variable names #that are also variable names in d1 d2[names(d2)==names(d2[names(d2)%in%names(d1)])] #check d2$y Cheers, Daniel ------------------------- cuncta stricte discussurus ------------------------- -----Ursprüngliche Nachricht----- Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Im Auftrag von Wade Wall Gesendet: Thursday, December 11, 2008 3:59 PM An: r-h...@stat.math.ethz.ch Betreff: [R] Extract rows from data frame based on row names from anotherdata frame Hi all, Is there a function to extract row names from a data frame based on row names from another data frame? I can write a loop function to do this, but this may be inefficient in terms of processing. thanks for any information, Wade ______________________________________________ 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. ______________________________________________ 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.
