ask for help
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) which( a==1 & c(TRUE, a[-length(a)]!=1) )
[1] 1 6 16 23
which( a==0 & c(TRUE, a[-length(a)]!=0) )
[1] 4 12 18 Bill Dunlap TIBCO Software wdunlap tibco.com
On Wed, Aug 6, 2014 at 7:12 PM, Johnnycz <johnnycz at yeah.net> wrote:
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
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