[R] Reorganizing Data Frame

chris99 cheakes at hotmail.com
Tue Jan 18 20:50:16 CET 2011

Hi I need some help trying to restructure a data frame:

I have:
food    transaction     quantity
pizza         BUY              5
pizza         SELL              3
apple         BUY              2
orange       SELL              1
pizza         BUY               2

And the data frame I want to make is:

food        BUY          SELL
pizza         7             3
apple         2             0
orange       0             1

I can't figure out the commands to use. Can anyone help?
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