Am 14.11.2010 13:02, schrieb lgpeco:
hy guys i have one question :)
i have two vectors markets and price
market<- c(1, 5, 7, 9, 9, 6, 5, 4, 4, 3, 1, 2, 1)
price<- c(100, 20, 30, 10, 50, 23, 23, 33, 96, 6, 4, 38, 96)
i would like sum prices: market 1: (100+4+96), market 2: (38),..., market 9:
(10+50)
ao i would like get this result: (200, 38, ..., 60)
and i don't wanna use while, for loops... is there any other function to sum
these :)
tnx for helping ;)
you could cbind() the vectors and use sum( result[row1==i] ) for market
number i, I guess?
-- Alexx
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