Hi experts, I have encountered a strange phenomenon after loading spreadsheet data via >example<-read.csv("M:\\...\\mydata.csv",header=T)
My data consist of two variables x and y which I have combined to a single vector using >z<-rowSums(cbind(example$x,example$y)) >z [1] 9.79 9.79 17.54 12.59 2.18 9.79 #vector z with 6 elements Now I want to identify all elements equal to 9.79, so I enter >which(z==9.79) And I get the result [1] 2 6 #R failes to identify the fist element! Taking a futher look at the elements I get the following: > mode(z) [1] "numeric" > mode(z[1]) [1] "numeric" > z[1]+z[2] #I can > add first and second element [1] 19.58 But if I try to apply logical operators I get: > z[1]==9.79 [1] FALSE > z[2]==9.79 [1] TRUE > z[1]==z[2] [1] FALSE When I reenter the first element via > z[1]<-9.79 > z[1]==9.79 [1] TRUE What is wrong with my data? Can anyone help? > version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 11.1 year 2010 month 05 day 31 svn rev 52157 language R version.string R version 2.11.1 (2010-05-31) Thanks D. Alain ______________________________________________ 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.