Re: [R] Modifying a data frame based on a vector that contains column numbers

2013-03-14 Thread Dimitri Liakhovitski
NA NA 1 > #4 NA 1 NA > #5 1 NA NA > > > identical(mydf1,mygoal) > #[1] TRUE > A.K. > > > > - Original Message - > From: Dimitri Liakhovitski > To: r-help > Cc: > Sent: Wednesday, March 13, 2013 8:10 PM > Subject: [R] Modifying a data frame ba

Re: [R] Modifying a data frame based on a vector that contains column numbers

2013-03-13 Thread arun
o: r-help Cc: Sent: Wednesday, March 13, 2013 8:10 PM Subject: [R] Modifying a data frame based on a vector that contains column numbers Hello! # I have a data frame: mydf<-data.frame(c1=rep(NA,5),c2=rep(NA,5),c3=rep(NA,5)) # I have an index whose length is always the same as nrow(mydf)

Re: [R] Modifying a data frame based on a vector that contains column numbers

2013-03-13 Thread William Dunlap
nal Message- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf > Of Dimitri Liakhovitski > Sent: Wednesday, March 13, 2013 5:11 PM > To: r-help > Subject: [R] Modifying a data frame based on a vector that contains column > numbers >

[R] Modifying a data frame based on a vector that contains column numbers

2013-03-13 Thread Dimitri Liakhovitski
Hello! # I have a data frame: mydf<-data.frame(c1=rep(NA,5),c2=rep(NA,5),c3=rep(NA,5)) # I have an index whose length is always the same as nrow(mydf): myindex<-c(1,2,3,2,1) # I need c1 to have 1s in rows 1 and 5 (based on the information in myindex) # I need c2 to have 1s in rows 2 and 4 (also