[R] sum in vector

[Andrew Dolman]

tapply(price, market, sum)

andydolman at gmail.com



On 14 November 2010 13:02, lgpeco <pavic.olic at gmail.com> wrote:
>
> 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 ;)
> --
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