[R] Vector from Matrix

[Henrique Dallazuanna]

Try this also:

pmin(data.set[,1:100], data.set[,101:200])/colSums(data.set[,101:200])


On Fri, Jan 29, 2010 at 2:25 PM, Thiem  Alrik <thiem at sipo.gess.ethz.ch> wrote:
> Dear Mailing List Members,
>
> the problem I've been grappling with für quite some time now is the following:
>
> I have a 100 rows x 200 columns matrix.
>
> data.set <- matrix(rnorm(20000, 100, 200))
>
> Now I would like to get a vector of length 100 which collects the values from the following procedure:
>
> Take the sum of the minima of the two values from each row of columns 1 and 101, and divide it by the sum of column 101.
> Do the same for column 2 and 102, 3 and 103 and so on.
>
> Thanks a lot for your help.
>
> Alrik
>
> *******************************************
> Alrik Thiem
> Research Assistant
>
> WEC E17
> Weinbergstrasse 11
> Center for Comparative and International Studies (CIS)
> and Center for Security Studies (CSS)
> Swiss Federal Institute of Technology Zurich
> CH-8092 Zurich
>
> Tel.: 0041 44 63 20937
> thiem at sipo.gess.ethz.ch
> http://www.cis.ethz.ch/
> http://www.css.ethz.ch/
> *******************************************
>
>
>
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O