Hi, Great chance to practice debugging. Rather than trying one complicated statement, break it into pieces. The basic structure is:
results <- ifelse(condition, value if true, value if false) Each argument needs to be a vector of the same length. In your case, condition itself consists of two vectors: v1 >= v2 so try creating all four vectors and making sure they are what you want and are the appropriate length. Then: results <- ifelse(v1 >= v2, VIT, VIF) will work. Cheers, Josh On Thu, Jul 5, 2012 at 3:52 PM, jcrosbie <ja...@crosb.ie> wrote: > Thank you, > > I tired > > ifelse(tUnitsort[length(tUnitsort$Hour),4]>=tUnitsort[-1,4],(tempMC > =tUnitsort[length(tUnitsort$Hour),7]),tempMC ) > > But this doesn't seem to work. > > Where am I going wrong? > > -- > View this message in context: > http://r.789695.n4.nabble.com/remove-loop-which-compares-row-i-to-row-i-1-tp4635327p4635566.html > Sent from the R help mailing list archive at Nabble.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. -- Joshua Wiley Ph.D. Student, Health Psychology Programmer Analyst II, 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.