Given a vector a=[1,2, 3.2, 4, 5] and an element x=3 In vector a, how to find the exact entry which is bigger than x?

Given a vector a=[1,2, 3.2, 4, 5] and an element x=3 In vector a, how to find the exact entry which is bigger than x? In R开发者_高级运维, is there any function to do that?

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> a <- c(1,2, 3.2, 4, 5)
> x <- 3
> a[a > x]
[1] 3.2 4.0 5.0
> min(a[a > x])
[1] 3.2

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the answer...

 min(a[a>3])

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Or the longer one:

which(x < a)
## [1] 3 4 5
which(a > x)
## [1] 3 4 5

As you can see, it returns vector indices.