Hi Edward, You can try something like:
u.ppl <- unique(init.dat1$grid) l.ppl <- ifelse(grepl(4, init.dat1$Slide1_RESP), 2, init.dat1$Slide1_RESP) Note that this is not exact as you have not provided a reproducible example. I am not exactly sure how you are putting 1 for 2 and 2 for 4, if the value is equal to 4, but presumably it is clearer with data. In any event, look at ?ifelse it is something like a vectorized if statement and is, I believe, preferable to your use of a for loop. I can probably give you a runnable solution if you can give the first few rows of the relevant data. Cheers, Josh On Fri, Aug 5, 2011 at 2:15 PM, Edward Patzelt <patze...@umn.edu> wrote: > I want to write code that says "If you find an element equal to 4 in this > vector for each person in the data set tested separately, then put in 1 for > 2 and 2 for 4, else leave the variable as is" > > u.ppl <- (unique(init.dat1$grid)) > l.ppl <- length(u.ppl) > for (i in 1:l.ppl) > { > if (grep("4",init.dat1$Slide1_RESP)) {2 == 1, 4 == 2}; else > init.dat1$Slide1_RESP > > } > > -- > Edward H. Patzelt > Research Assistant – TRiCAM Lab > University of Minnesota – Psychology/Psychiatry > VA Medical Center > Office: S355 Elliot Hall - Twin Cities Campus > Phone: 612-626-0072 Email: patze...@umn.edu > > Please consider the environment before printing this email > www.psych.umn.edu/research/tricam > > [[alternative HTML version deleted]] > > > ______________________________________________ > 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. > > -- Joshua Wiley Ph.D. Student, Health Psychology Programmer Analyst II, ATS Statistical Consulting Group University of California, Los Angeles https://joshuawiley.com/ ______________________________________________ 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.