[R] sum in vector

[John Kane]

Have a look at the reshape2 package.  http://had.co.nz/reshape/
reshape2 is, to the user a slight modification of rehape but the author says it is much faster.

The code below seems to do what you want.
-------------------------------------------------------------
xx <- data.frame(market, price)
library(reshape2)
yy <- melt(xx, id=1)
dcast(yy, market ~ variable, sum)
-------------------------------------------------------------

--- On Sun, 11/14/10, lgpeco <pavic.olic at gmail.com> wrote:

> From: lgpeco <pavic.olic at gmail.com>
> Subject: [R] sum in vector
> To: r-help at r-project.org
> Received: Sunday, November 14, 2010, 7:02 AM
> 
> 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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