I think this is what you are looking for.
> tmp <- matrix(sample(20), 5, 4)
> tmp
[,1] [,2] [,3] [,4]
[1,] 6 15 18 20
[2,] 4 5 10 19
[3,] 7 9 1 3
[4,] 8 14 11 13
[5,] 17 12 16 2
> t(apply(tmp, 1, diff))
[,1] [,2] [,3]
[1,] 9 3 2
[2,] 1 5 9
[3,] 2 -8 2
[4,] 6 -3 2
[5,] -5 4 -14
>
On Mon, Dec 17, 2012 at 12:16 PM, kevj1980 <kevin.kid...@cameronhume.com>wrote:
> Hi, I have an n x m matrix of numerical observations. ie. stock prices
>
> I wish to convert the matrix of observations to a matrix of simple returns
> (by taking the differences between (column) observations.)
>
> Can any good soul suggest a function for this?
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/R-beginner-matrix-algebra-tp4653335.html
> Sent from the R help mailing list archive at Nabble.com.
>
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