Suppose I have the following data frame:
a - b - c
0 - 10 - 40
1 - 20 - 50
2 - 30 - 60
Except for the first row, I'd like to end up with this: (I'm adding each cell value with the one right before it)
a - b - c
0 - 10 - 40
1 - 30 - 90
2 - 60 - 150
Is this possible without using a for loop?
