Create counter of consecutive runs of a certain value

by 
SOG <- c(4,4,0,0,0,3,4,5,0,0,1,2,0,0,0)
#run length encoding:
tmp <- rle(SOG)
#turn values into logicals
tmp$values <- tmp$values == 0
#cumulative sum of TRUE values
tmp$values[tmp$values] <- cumsum(tmp$values[tmp$values])
#inverse the run length encoding
inverse.rle(tmp)
#[1] 0 0 1 1 1 0 0 0 2 2 0 0 3 3 3

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