I don't see right off why the one works and the other doesn't, but this looks like one of those cases that would be better done using a list rather than global variables.
Instead of assigning the variables in the global workspace, create a list and assign them there. Then you can use lapply instead of a loop and you avoid the potential pitfalls associated with globals. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Thomas Schwander > Sent: Thursday, January 22, 2009 12:38 PM > To: r-help@r-project.org > Subject: [R] looping over a string > > Hi list, > > I'm using R 2.8.1 under Windows vista. I have the following problem: > > First of all I create a string-vector. Then I "convert" these strings > into variables and assign a vector of numeric values. So far > everything's fine. > Now I want to do nearly the same again: I create another string-vector > and I want to assign the variance. So I have to loop over the first > string-vector. > But this does not work unfortunately. I looked in the R-list-search but > I cannot find the right answer. > > Please find enclosed the pseudo-code: > > #Tage zwischen berechnung und 31.03.2009 > Berechnung<-as.Date("22.01.2009","%d.%m.%Y") > Enddatum<-as.Date("31.03.2009","%d.%m.%Y") > Tage<-difftime(Enddatum, Berechnung) > Tage<-as.numeric(substr(format(Tage),1,2)) > > #maximal interessierend sind 100 Tage (4 Monate)-Differenzen > max_int<-82 > Tage<-max_int > max_bob<-82 > > varnames<-paste("st_rendite_",seq(max_int),sep="") > analyse<-rnorm(10000) > for(i in 1:min(max_bob,max_int)){ > assign(varnames[i],diff(log(analyse),i)*100) > } > > #Wurzel_t - Approximation überprüfen > varianzen<-paste("var_",seq(Tage),sep="") > for(i in 1:Tage){ > #in this line is the error I cannot handle (st_rendite_i): > assign(varianzen[i],var(st_rendite_i)/100^2) > } > > Thanks for your help, > Thomas > > ______________________________________________ > 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. ______________________________________________ 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.