How to use tapply with more than one variables grouped

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of noobmin
Sent: Tuesday, October 23, 2012 2:52 PM
To: r-help at r-project.org
Subject: Re: [R] How to use tapply with more than one variables grouped

I used these commands previously:

data <- read.csv("test.csv")

tbl=

data.frame(tapply(data$contb_receipt_amt,list(data$cand_nm,data$contbr_
st),sum))

tbl

                AL  AR  CA  NY
Doug     250 250 250  NA
Jennifer  20 340 300 100
Michele  250 500 250  60
Obama     15  45 520 600



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