Thanks Bert, here it is in plain.
Hello, please see if you have a thought on how to achieve the following: we have: df<-data.frame(a=Sys.Date()+1:10, b=Sys.Date()+c(NA,NA,NA,rep(3,4),NA,NA,3), c=Sys.Date()+c(NA,NA,NA,rep(9,4),NA,NA,9)) the idea I have difficulty wrapping my head around is to do the following: I need the system to look at df$a by row (lets call it the index row) and look at df$b and df$c 1 row before the given row in df$a (lets call it index row -1) and evaluate if the index row value in df$a falls into the range (>= and <=) of the index row -1 values in df$b and df$c. If it does, then copy over the index row -1 values in df$b and df$c into the index row in df$b and df$c, if not place an NA in both cells of the index row in df$b and df$c. examples: 1. the date value in df$a[8] is between df$b[7] and df$c[7] so we can copy the values in df$b[7] and df$c[7] into df$b[8] and df$c[8] 2. the date value in df$a[9] is between df$b[8] and df$c[8] (as we copied it in in step 1) so we can copy the values in df$b[8] and df$c[8] into df$b[9] and df$c[9] 3. the date value in df$a[10] is NOT between df$b[9] and df$c[9] (as we copied it in in step 2) so we can place NA in df$b[10] and df$c[10] also would like to do this going up, too, similar to fill(...,"downup"). On the end we would want to have this: dfwanted<-data.frame(a=Sys.Date()+1:10, b=Sys.Date()+c(NA,NA,rep(3,7),NA), c=Sys.Date()+c(NA,NA,rep(9,7),NA)) much appreciate any help you could provide. thanks, Andras Andras ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
