Hello,everybody,
         I have a sequence,like 
a<-c(1,1,1,0,0,1,1,1,1,1,1,0,0,0,0,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1),how to 
get the position of each first 1 and 0, that's to say, how to get 
b<-c(1,6,16,23) for first 1 and d<-c(4,12,18) for first 0.
        Many thanks!
Johnny
        [[alternative HTML version deleted]]

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