Dear Dimitris 
Thanks a lot. 




----- Original Message ----
From: Dimitris Rizopoulos <d.rizopoulos@erasmusmc.nl>
To: Muhammad Azam <mazam72@yahoo.com>
Cc: R Help <r-help@r-project.org>
Sent: Tuesday, October 14, 2008 10:10:54 AM
Subject: Re: [R] request: How to ignore columns having zero sums

try this:

x <- c(1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,0,0,0,0,0,0,0,0);
x1 <- array(x, dim=c(4,6))

ind <- colSums(x1) != 0
x1[, ind]


I hope it helps.

Best,
Dimitris


Muhammad Azam wrote:
> Dear friends
> I have an array consist of r-rows and c-columns e.g.
> x=c(1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,0,0,0,0,0,0,0,0); 
> x1=array(x, dim=c(4,6))
> output is
>> x1
>      [,1] [,2] [,3] [,4] [,5] [,6]
> [1,]    1    2    3    4    0    0
> [2,]    1    2    3    4    0    0
> [3,]    1    2    3    4    0    0
> [4,]    1    2    3    4    0    0
> How can i ignore columns having zero sums? Help in this regard is needed. Thanks
> 
>  
> M.Azam
> 
> 
>      
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> 
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
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