r - Select only specific cases from dataframe -

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how can select rows followed same value in specific column?

i.e. (using reference values of v1)

`v1 = c(1,1,2,3,1,2,4,1,1,2,3,4)  v2 = seq(1:12)  v3 = c(rep("blue", 4), rep("red", 4), rep("green", 4))  df<- data.frame(v1, v2, v3)  df`  > df    v1 v2    v3 1   1  1  blue 2   1  2  blue 3   2  3  blue 4   3  4  blue 5   1  5   red 6   2  6   red 7   4  7   red 8   1  8   red 9   1  9 green 10  2 10 green 11  3 11 green 12  4 12 green

to this; cases 1 , 8, followed cases value v1 1 saved

  v1 v2   v3 1  1  1 blue 8  1  8  red

you extract indices of interest which, , extract rows of interest dataframe.

indices <- which(df$v1[1:(nrow(df)-1)]==df$v1[2:nrow(df)]) df.new <- df[indices,]

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