r - How to sum values from same names? -

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this question has answer here:

r program

i need sum values same names repeated in list.

i have list like,

  person  money 1  1        3 2  2        1 3  1        2 4  3        1 5  2        1

i need, 

  person  money 1  1    (3+2=)5 2  2        2 3  3        1

here solution ddply plyr 

library(plyr) z=data.frame(ddply(yourdataframe,.(person),summarise))

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