在值的连续运行中创建计数器 [英] Create counter within consecutive runs of values
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问题描述
I wish to create a sequential number within each run of equal values, like a counter of occurrences, which restarts once the value in the current row is different from the previous row.
Please find an example of input and expected output below.
dataset <- data.frame(input = c("a","b","b","a","a","c","a","a","a","a","b","c"))
dataset$counter <- c(1,1,2,1,2,1,1,2,3,4,1,1)
dataset
# input counter
# 1 a 1
# 2 b 1
# 3 b 2
# 4 a 1
# 5 a 2
# 6 c 1
# 7 a 1
# 8 a 2
# 9 a 3
# 10 a 4
# 11 b 1
# 12 c 1
My question is very similar to this one: Cumulative sequence of occurrences of values.
解决方案
You need to use sequence
and rle
:
> sequence(rle(as.character(dataset$input))$lengths)
[1] 1 1 2 1 2 1 1 2 3 4 1 1
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