[R] keep only the first value of a numeric sequence

[jeff6868]

Hello dear R-helpers,

I have a small problem in my algorithm. I have sequences of "0" and "1"
values in a column of a huge data frame, and I just would like to keep the
first value of each sequences of "1" values, such like in this example:

data <-
data.frame(mydata=c(0,0,0,1,1,1,1,1,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,1,1,1),final_wished_data=c(0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0))

Any easy way to do this?

Thanks everybody!




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