Hi Or some rounding when comparing results with threshold exactly.
> round(abs(0.95 - 1),2) > 0.05 [1] FALSE > round(abs(0.95 - 1),2) < 0.05 [1] FALSE > Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Rainer > Johannes > Sent: Tuesday, April 5, 2016 4:33 PM > To: Thierry Onkelinx <thierry.onkel...@inbo.be> > Cc: r-help@r-project.org; Adrian Dușa <dusa.adr...@unibuc.ro> > Subject: Re: [R] Problem with <= (less than or equal): not giving the expected > result > > 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.adria > n...@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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. 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