[R] find position

[Benilton Carvalho]

which(a == .4)[1]

b

On Jun 10, 2007, at 4:45 AM, gallon li wrote:

> find the position of the first value who equals certain number in a  
> vector:
>
> Say a=c(0,0,0,0,0.2, 0.2, 0.4,0.4,0.5)
>
> i wish to return the index value in a for which the value in the  
> vector is
> equal to 0.4 for the first time. in this case, it is 7.
>
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>
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