Hi Everbody

Could somebody help me.?

I need to remove the columns where the sum of it components is equal to
zero.

For example

> a<-matrix(c(0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,1,1,0,0,1,0), ncol=4)
> a
     [,1] [,2] [,3] [,4]
[1,]    0    0    0    1
[2,]    0    1    0    1
[3,]    0    0    0    0
[4,]    0    1    0    0
[5,]    0    0    0    1
[6,]    0    0    0    0

Columns 1 and 3 should be removed

the result should be the dollowing matrix

     [,2]  [,4]
[1,]    0    1
[2,]    1    1
[3,]    0    0
[4,]    1    0
[5,]    0    1
[6,]    0    0

Thanks again


-- 
Alberto Lora Michiels
Rue du Progrès,  6B
7860 Lessines
GSM 32(0)496659457

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