One function to detect NaN, NA, Inf, -Inf, etc.?

Is there a single function in R that determines if a value is NA,开发者_C百科 NaN, Inf, -Inf, or otherwise not a well-formed number?

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You want is.finite

> is.finite(NA)
[1] FALSE
> is.finite(NaN)
[1] FALSE
> is.finite(Inf)
[1] FALSE
> is.finite(1L)
[1] TRUE
> is.finite(1.0)
[1] TRUE
> is.finite("A")
[1] FALSE
> is.finite(pi)
[1] TRUE
> is.finite(1+0i)
[1] TRUE