Have a close look at ?storage.mode and ?typeof. The problem here, as usual and as you seem to allude is: define "integer" . Mathematically, there is an unequivocal definition, but not so in finite precision arithmetic. Are you referring to the machine representation (typeof()), or the approximate value. And if the latter, how approximate?
I think both your solution and its perceived "beauty" will depend on your exact definition and context. You may receive wiser advice. If so, please ignore mine. Cheers, Bert On Thu, Sep 8, 2011 at 11:27 AM, Alexander Engelhardt <a...@chaotic-neutral.de> wrote: > Hi, > > x <- 0.2*5 > is.integer(x) > > gives me FALSE because R stores it as a float number, right? > Is there an elegant way to work around that problem? Right now > I'm using > > x <- 0.2*5 > round(x) == x > > which returns TRUE. But more strictly I should use all.equal(), > right? > > I somehow just don't like the--pardon--ugliness of those pieces > of code. Maybe there is a beautiful way to write that. If not, > no big problem -- I just like beautiful code :-) > > Cheers, > Alex > > ______________________________________________ > 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. > -- "Men by nature long to get on to the ultimate truths, and will often be impatient with elementary studies or fight shy of them. If it were possible to reach the ultimate truths without the elementary studies usually prefixed to them, these would not be preparatory studies but superfluous diversions." -- Maimonides (1135-1204) Bert Gunter Genentech Nonclinical Biostatistics 467-7374 http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.
