r - How to extract all rows between start signal and end signal? -


i have following df , extract rows based on following start , end signals.

start signal : when status changes 1 0 end signal : when status changes 0 -1.

df <- data.frame(time = rep(1:14), status = c(0,1,1,0,0,0,-1,0,1,0,0,0,-1,0))     time status 1     1      0 2     2      1 3     3      1 4     4      0 5     5      0 6     6      0 7     7     -1 8     8      0 9     9      1 10   10      0 11   11      0 12   12      0 13   13     -1 14   14      0

desire:

   time status     4     4      0 5     5      0 6     6      0 10   10      0 11   11      0 12   12      0

here's possible solution using data.table package. i'm first grouping status == 1 appearances , checking per group if there status == -1, if so, i'm sub-setting group second incident until -1 incident minus 1

library(data.table) setdt(df)[, indx := cumsum(status == 1)] df[, if(any(status == -1)) .sd[2:(which(status == -1) - 1)], = indx] #    indx time status # 1:    2    4      0 # 2:    2    5      0 # 3:    2    6      0 # 4:    3   10      0 # 5:    3   11      0 # 6:    3   12      0

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