Melanie Abecassis <[EMAIL PROTECTED]> wrote in news:[EMAIL PROTECTED]:
> Hi, > I'm having trouble with the "which" or the "seq" function, I'm not > sure. Here's an example : > > > > lat=seq(1,2,by=0.1) > > lat > [1] 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 > > > which(lat==1) > [1] 1 > > which(lat==1.1) snip > [1] 7 > > which(lat==1.7) > *integer(0)* > This doesn't seem to happen with integers. > Am I missing something ?? Is there a better function for > non-integers ? Read the FAQ (Section 7.31 Why doesn't R think these numbers are equal? http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f and look at this: > lat - 1.7 [1] -7.000000e-01 -6.000000e-01 -5.000000e-01 -4.000000e-01 [5] -3.000000e-01 -2.000000e-01 -1.000000e-01 2.220446e-16 [9] 1.000000e-01 2.000000e-01 3.000000e-01 -- David Winsemius ______________________________________________ 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.