[R] how to return indexes

[demolombe]

Hello,

I wonder how to retreive indexes of data (and not data themseleves)

example: a vector x<-c(10,20,30,40,50,60)
               a filter: f <- x>30 does retreive : 40,50,60
                          f <- x[x>30] retreive
false,false,false,true,true,true

i would retreive the indexes: 4,5,6  because the 4th, 5th and 6th values
were selected

(this easy with matlab, but with R I know only sort(..., index.return=TRUE)
 which does that

thank you for help

Vincent

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