Hi Kristina: That's because I gave you the wrong function. It should be "with" not "within", as:
sort2v4$adj_mean<-with(sort2v4, ave(mean, point, FUN=function(x)x-x[1])) within(dat,...) returns dat suitably modified. with (dat,...) just returns the result of the function. I frequently use within() when I mean with(), unfortunately. Sorry for the error. -- Bert On Sun, Jul 1, 2012 at 6:39 PM, Kristiina Hurme <kristiina.hu...@uconn.edu>wrote: > Thanks everyone. > I tried them all, and got all to work except for the last one. > > I tried > > sort2v4$adj_mean<-within(sort2v4, ave(mean, point, > FUN=function(x)x-x[1])) > > head(sort2v4) > point time mean sd adj_mean.point adj_mean.time adj_mean.mean > adj_mean.sd > 1 1 1 52.50100 1.5073927 1 1 52.50100 > 1.5073927 > 3 1 2 54.50182 0.8510329 1 2 54.50182 > 0.8510329 > 4 1 3 56.60174 1.5787222 1 3 56.60174 > 1.5787222 > 5 1 4 57.20000 1.2292726 1 4 57.20000 > 1.2292726 > 6 1 5 59.30000 2.2632327 1 5 59.30000 > 2.2632327 > 7 1 6 57.80089 1.4745218 1 6 57.80089 > 1.4745218 > > but am getting the columns in duplicate, rather than it performing the > function. Any advice? > > Thanks again, > Kristiina > > -- > View this message in context: > http://r.789695.n4.nabble.com/How-to-adjust-the-start-of-a-series-to-zero-i-e-subtract-the-first-value-from-the-sequence-tp4634999p4635062.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. > -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm [[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.
