Based on the table bellow, I am trying to add all the numbers in colmn B
between two 1s in column A. To state it in anotger way, in column C every
time column A equals 1, I want to add the last x many cells of column B.
A B C
1 5 5
5 0
1 5 10
5 0
1 5 10
5 0
The problem is that the frequency at which the 1s in column A appear changes.
Is there a formula that would either tell cells in column C to add all the
values in column B since the last 1 in column A or alternatevely to tell the
cells in column C to add the last x number of cells in column B. I hope this
makes sense.
Thanks. Neda