[S] condensing a dataframe sequentially

["Valerie Zartarian" <VZARTARIAN@usgs.gov>]

Hi,

My original dataframe VZ.df looks like:
V1          V2            V3            V4          V5
a       b       d       g       5
a       b       d       g       5
a        b      d       g       5
a        b      d       g       5
a       c       e       g       5
a       c       e       h       5
a       c       e       g       5
a       c       e       g       5
a       c       e       h       5
a       c       e       h       5
a       c       f       g       5
a       c        f      g       5

I want to aggregate V5 over common rows sequentially as follows:

a       b       d       g       20
a       c       e       g       5
a       c       e       h       5
a       c       e       g       10
a       c       e       h       10
a       c       f       g       10

Any ideas on how to do it without a for loop?

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