On Tue, 2008-12-09 at 06:02 -0800, emma jane wrote: > Many thanks for your help, perhaps I should have set my query in context .... > ! > > I'm simply calculating an indicator variable [0,1] based on the whether the > difference between two measured variables is > 1 or <=1. > > I understand the FAQ about floating point arithmetic, but am still puzzled > that it only apparently applies to certain elements, as follows: > > 8.8 - 7.8 > 1 > > TRUE > > 8.3 - 7.3 > 1 > > TRUE > > However, > > 10.2 - 9.2 > 1 > >FALSE > > 11.3 - 10.3>1 > > FALSE > > Emma Jane
Emma, This solve two forms: 1- use all.equal > all.equal((10.2 - 9.2),1) [1] TRUE 2- use round > round(10.2 - 9.2,0)>1 [1] FALSE > round(10.2 - 9.2,0)>=1 [1] TRUE -- Bernardo Rangel Tura, M.D,MPH,Ph.D National Institute of Cardiology Brazil ______________________________________________ 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.
