Thanks! On 05 Apr 2016, at 16:07, Thierry Onkelinx <thierry.onkel...@inbo.be<mailto:thierry.onkel...@inbo.be>> wrote:
You could use something like this x <- abs(0.95 - 1) treshold <- 0.05 x < treshold | abs(x - treshold) < 1e-6 ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance Kliniekstraat 25 1070 Anderlecht Belgium To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey 2016-04-05 14:46 GMT+02:00 Rainer Johannes <johannes.rai...@eurac.edu<mailto:johannes.rai...@eurac.edu>>: Thanks Adrian and Thierry (from the previous answer). I was aware of the all.equal function, but there is nothing similar for <= (e.g. all.smallerEqual)? cheers, jo On 05 Apr 2016, at 14:31, Adrian Dușa <dusa.adr...@unibuc.ro<mailto:dusa.adr...@unibuc.ro><mailto:dusa.adr...@unibuc.ro<mailto:dusa.adr...@unibuc.ro>>> wrote: Yes, that does have to do with floating point representation. I use this function for these types of comparisons (works with values as well as with vectors): check.equal <- function(x, y) { check.vector <- as.logical(unlist(lapply(x, all.equal, y))) check.vector[is.na<http://is.na/><http://is.na/>(check.vector)] <- FALSE return(check.vector) } See: ?all.equal Hth, Adrian On Tue, Apr 5, 2016 at 2:34 PM, Rainer Johannes <johannes.rai...@eurac.edu<mailto:johannes.rai...@eurac.edu><mailto:johannes.rai...@eurac.edu<mailto:johannes.rai...@eurac.edu>>> wrote: Dear All, I have the following problem: I have a function in which I check if the difference between values is smaller or equal to a certain threshold. I however realized that I might get there some unexpected results: > abs(1 - 0.95) >= 0.05 [1] TRUE ## So that’s fine, but: > abs(1 - 0.95) <= 0.05 [1] FALSE Apparently, abs(1 - 0.95) is not equal to 0.05, which I find however quite disturbing. Along these lines: > abs(0.95 - 1) > 0.05 [1] TRUE > abs(0.95 - 1) < 0.05 [1] FALSE I guess that has to do with the floating point representation of the data? Is there something I miss or is there any solution to this? Thanks for any help! cheers, jo I tried this on different R-version (including 3.2.3 and 3.3.0 alpha); The R-version I used for the code above is: > sessionInfo() R version 3.0.2 (2013-09-25) Platform: x86_64-unknown-linux-gnu (64-bit) locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base ______________________________________________ R-help@r-project.org<mailto:R-help@r-project.org><mailto:R-help@r-project.org<mailto:R-help@r-project.org>> mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html><http://www.r-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code. -- Adrian Dusa University of Bucharest Romanian Social Data Archive Soseaua Panduri nr.90 050663 Bucharest sector 5 Romania [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
