[R] how to judge a virable is a integer?

[S Ellison]

> But i use a<-10/b ,  b is some value ,may be  5, maybe 5.5
If you do floating point arithmetic on integers you'll usually get floating point answers, including the 5.0.

See FAQ 7.31 for the usual floating point problem, and ?all.equal for the usual answer to it. You could see if a result is close to an integer by,for example, using all.equal to compare it to itself after rounding.

S

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