Dear David and Rui,
Thankyou very much. :D
Eliza

> From: dcarlson@tamu.edu
> To: eliza_botto@hotmail.com; r-help@r-project.org
> Subject: RE: [R] average of rows of each column
> Date: Fri, 4 Apr 2014 15:14:32 -0500
> 
> Something like (only 20 columns here):
> 
> x <- matrix(rnorm(120*20), 120, 20)
> xagg <- aggregate(x, list(rep(1:12, each=10)), mean)
> 
> -------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77840-4352
> 
> ----Original Message-----
> From: r-help-bounces@r-project.org
> [mailto:r-help-bounces@r-project.org] On Behalf Of eliza botto
> Sent: Friday, April 4, 2014 1:08 PM
> To: r-help@r-project.org
> Subject: [R] average of rows of each column
> 
> 
> Dear useRs,
> I have a matrix of 120 row and 1000 columns.What I want is to
> get an average of a set of 12 rows starting from 1 till 120 for
> each column. Precisely, for column 1 the average of 1:10 rows,
> 11:20 rows.... 111:120. similarly for column 2, 3, 4.... 1000.
> So in the end i should have a matrix with 12 rows and 1000
> columns.
> Thankyou very much in advance.
> 
> Eliza
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