R programming How to subset data and plot graphs in R

Question

I have a data set consisting of 0s and 1s in a column. I figured out the row index where the toggling happens and now I want to sample out data from these by setting these particular row IDS. 

Here's my data frame:

row id   mode 
1          0
2          0
3          1
4          1
5          0
6          0
7          0
8          1
9          1
10         1

Once I split the data frame, I should get 4 other data frames like so:

y[1] : 
row id   mode 
1           0
2           0

y[2]
row id     mode 
3            1 
4            1

y[3]
row id      mode 
5            0
6            0
7            0

Answer 1

You can create a grouping variable depending on the difference of adjacent elements in 'mode' and then split the data set:

split(df1, cumsum(c(TRUE, diff(df1$mode)!=0)))
#$`1`
#  row id mode
#1      1    0
#2      2    0

#$`2`
#  row id mode
#3      3    1
#4      4    1

#$`3`
#  row id mode
#5      5    0
#6      6    0
#7      7    0

#$`4`
#   row id mode
#8       8    1
#9       9    1
#10     10    1