[R] Subcripting matrix

[Olivier Crouzet]

Hi,

it seems the following works as needed...

Mat[,colnames(Mat)=="a"]

Olivier.

On Fri, 20 Sep 2013 16:22:37 +0530
Christofer Bogaso <bogaso.christofer at gmail.com> wrote:

> Hello again,
> 
> I have one question on subscripting matrix. Let say I have following
> matrix:
> 
> > Mat <- matrix(1:9, 3)
> > colnames(Mat) <- c("a", "b", "a")
> > Mat
>      a b a
> [1,] 1 4 7
> [2,] 2 5 8
> [3,] 3 6 9
> 
> 
> Now I want to fetch data for colnames 'a'.I did following:
> 
> > Mat[, "a"]
> [1] 1 2 3
> 
> 
> However it is not taking second 'a' colume. Basically I expected to
> get 1st and 3rd columns
> 
> Can somebody tell me how to achieve that?
> 
> Thanks and regards,
> 
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-- 
  Olivier Crouzet, PhD
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