Sequence of win streaks

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6
down vote

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I'm trying to calculate a sequence of win streaks for a binary vector. Given a vector



set.seed(2)
x <- sample(c(0,1), 10, replace = TRUE)
[1] 0 1 1 0 1 1 0 1 0 1


I want to calculate the cumulative sum of ones with a "reset" every time there's a zero.
So, in this case, the output of the function should be



[1] 0 1 2 0 1 2 0 1 0 1


What's the easiest way to do this on R?




r




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  • 1




    See Count how many consecutive values are true and 'Linked' therein.
    – Henrik
    Aug 13 at 7:06














up vote
6
down vote

favorite
1












I'm trying to calculate a sequence of win streaks for a binary vector. Given a vector



set.seed(2)
x <- sample(c(0,1), 10, replace = TRUE)
[1] 0 1 1 0 1 1 0 1 0 1


I want to calculate the cumulative sum of ones with a "reset" every time there's a zero.
So, in this case, the output of the function should be



[1] 0 1 2 0 1 2 0 1 0 1


What's the easiest way to do this on R?




r




share|improve this question
















  • 1




    See Count how many consecutive values are true and 'Linked' therein.
    – Henrik
    Aug 13 at 7:06












up vote
6
down vote

favorite
1









up vote
6
down vote

favorite
1






1





I'm trying to calculate a sequence of win streaks for a binary vector. Given a vector



set.seed(2)
x <- sample(c(0,1), 10, replace = TRUE)
[1] 0 1 1 0 1 1 0 1 0 1


I want to calculate the cumulative sum of ones with a "reset" every time there's a zero.
So, in this case, the output of the function should be



[1] 0 1 2 0 1 2 0 1 0 1


What's the easiest way to do this on R?




r




share|improve this question












I'm trying to calculate a sequence of win streaks for a binary vector. Given a vector



set.seed(2)
x <- sample(c(0,1), 10, replace = TRUE)
[1] 0 1 1 0 1 1 0 1 0 1


I want to calculate the cumulative sum of ones with a "reset" every time there's a zero.
So, in this case, the output of the function should be



[1] 0 1 2 0 1 2 0 1 0 1


What's the easiest way to do this on R?





r





share|improve this question











share|improve this question




share|improve this question










asked Aug 13 at 1:28









user3294195

5991420




5991420







  • 1




    See Count how many consecutive values are true and 'Linked' therein.
    – Henrik
    Aug 13 at 7:06












  • 1




    See Count how many consecutive values are true and 'Linked' therein.
    – Henrik
    Aug 13 at 7:06







1




1




See Count how many consecutive values are true and 'Linked' therein.
– Henrik
Aug 13 at 7:06




See Count how many consecutive values are true and 'Linked' therein.
– Henrik
Aug 13 at 7:06












1 Answer
1






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up vote
11
down vote



accepted










We can use ave and create a grouping variable with cumsum at every occurrence of 0 in the vector and count the consecutive numbers without 0 in each group. 



ave(x, cumsum(x==0), FUN = seq_along) - 1
#[1] 0 1 2 0 1 2 0 1 0 1





share|improve this answer
















  • 1




    This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
    – thelatemail
    Aug 13 at 1:55










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
11
down vote



accepted










We can use ave and create a grouping variable with cumsum at every occurrence of 0 in the vector and count the consecutive numbers without 0 in each group. 



ave(x, cumsum(x==0), FUN = seq_along) - 1
#[1] 0 1 2 0 1 2 0 1 0 1





share|improve this answer
















  • 1




    This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
    – thelatemail
    Aug 13 at 1:55














up vote
11
down vote



accepted










We can use ave and create a grouping variable with cumsum at every occurrence of 0 in the vector and count the consecutive numbers without 0 in each group. 



ave(x, cumsum(x==0), FUN = seq_along) - 1
#[1] 0 1 2 0 1 2 0 1 0 1





share|improve this answer
















  • 1




    This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
    – thelatemail
    Aug 13 at 1:55












up vote
11
down vote



accepted







up vote
11
down vote



accepted






We can use ave and create a grouping variable with cumsum at every occurrence of 0 in the vector and count the consecutive numbers without 0 in each group. 



ave(x, cumsum(x==0), FUN = seq_along) - 1
#[1] 0 1 2 0 1 2 0 1 0 1





share|improve this answer












We can use ave and create a grouping variable with cumsum at every occurrence of 0 in the vector and count the consecutive numbers without 0 in each group. 



ave(x, cumsum(x==0), FUN = seq_along) - 1
#[1] 0 1 2 0 1 2 0 1 0 1






share|improve this answer












share|improve this answer



share|improve this answer










answered Aug 13 at 1:31









Ronak Shah

22.2k83451




22.2k83451







  • 1




    This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
    – thelatemail
    Aug 13 at 1:55












  • 1




    This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
    – thelatemail
    Aug 13 at 1:55







1




1




This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
– thelatemail
Aug 13 at 1:55




This will be plenty fast for almost any occasion, but if someone is looking for an Rcpp option for this query - see here stackoverflow.com/a/51054267/496803
– thelatemail
Aug 13 at 1:55

















 

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