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...ot met before: What Every Computer Scientist Should Know About Floating-Point Arithmetic, by David Goldberg, originally published in the March, 1991 issue of Computing Surveys. PDF and HTML versions are widely available on the web (see Google), e.g. at http://www.physics.ohio-state.edu/~dws/grouplinks/floating_point_math.pdf Though over the years I've many times been there, done that, got bitten by the bugs, and bought the T-shirt [I have one from Florida depicting a large and joyful mosquito with proboscis dripping with blood] I still found this a revealing read, written in a style well-s...

Folks, I have got a strange behaviour when testing this: sum(x) != 1 let us set x<-c(70,134,1,5,0) and transform it in a vector of probabilities x<-x/sum(x) One expect sum(x) should be equal to 1, which is apparently the case > sum(x) [1] 1 However, when I try to test it I get: > if(sum(x) !=1) print("lost") else ("OK") [1] "lost" Which means