Hi, In addition to: mylist<-list(df1=data.frame(a=seq(1,10,1), c=seq(1,10,1), q10=rep('favour', 10)), df2=data.frame(a=seq(1,10,1), b=seq(15,24,1), q14=rep('favour', 10))) lapply(mylist,function(x) x[colnames(x)%in% c("a","q10","q14")])
you could also use: lapply(seq_along(mylist),function(i) mylist[[i]][names(mylist[[i]])%in% c("a","q10","q14")]) #[[1]] # a q10 #1 1 favour #2 2 favour #3 3 favour #4 4 favour #5 5 favour #6 6 favour #7 7 favour #8 8 favour #9 9 favour #10 10 favour #[[2]] # a q14 #1 1 favour #2 2 favour #3 3 favour #4 4 favour #5 5 favour #6 6 favour #7 7 favour #8 8 favour #9 9 favour #10 10 favour A.K. ----- Original Message ----- From: Simon Kiss <sjk...@gmail.com> To: r-help@r-project.org Cc: Sent: Monday, November 12, 2012 5:34 PM Subject: [R] select different variables from a list of data frames Hi: How do I select different variables from a list of data frames. I have a list of 13 that looks like below. Each data frame has more variables than I need. How do I go through the list and select the variables that I need. In the example below, I need to get the variables "a", and "q10" and "q14" to be returned to two separate data frames. Thank you. Yours, Simon Kiss #####Sample data mylist<-list(df1=data.frame(a=seq(1,10,1), c=seq(1,109,1), q10=rep('favour', 10)), df2=data.frame(a=seq(1,10,1), b=seq(15,24,1), q14=rep('favour', 10))) #The variables with different names that I need are q<-c('q10', 'q14') #My current code dat<-mapply(function(x,y) { data.frame(a=x$a, y$q) }, x=mylist, y=q) ______________________________________________ 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.