Great! Both ways works well for my whole data!
Thanks guys!
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we can speed this up a lot
> system.time(for (i in 1:2000) ifelse(c(0, diff(data$mydata)) != 1, 0, 1))
user system elapsed
0.122 0.012 0.132
> system.time(for (i in 1:2000) as.numeric( c(0, diff(data$mydata))==1))
user system elapsed
0.073 0.007 0.078
> ifelse(c(0, diff(data$my
Dear jeff6868,
Here is one way:
ifelse(with(data, c(0, diff(mydata))) != 1, 0, 1)
You could also take a look at ?rle
HTH,
Jorge.-
On Mon, Dec 15, 2014 at 9:33 PM, jeff6868 wrote:
>
> Hello dear R-helpers,
>
> I have a small problem in my algorithm. I have sequences of "0" and "1"
> values i
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,
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