Assuming that the "*" in your [11,] example is a typo, would this work?

apply(out$desc,1,paste,collapse="")

Hope this helps,

Michael Weylandt

On Thu, Aug 18, 2011 at 2:35 PM, Eduardo Mendes <emammendes@gmail.com>wrote:

> Dear R-Users
>
> I have the following matrix
>
> > out$desc      [,1]            [,2]
>  [1,] ""              ""
>  [2,] "y_{01}(k-001)" ""
>  [3,] "y_{01}(k-002)" ""
>  [4,] "y_{01}(k-003)" ""
>  [5,] "u_{01}(k-001)" ""
>  [6,] "u_{01}(k-002)" ""
>  [7,] "u_{01}(k-003)" ""
>  [8,] "y_{01}(k-001)" "y_{01}(k-001)"
>  [9,] "y_{01}(k-001)" "y_{01}(k-002)"
> [10,] "y_{01}(k-001)" "y_{01}(k-003)"
> [11,] "y_{01}(k-001)" "u_{01}(k-001)"
>
>
> and need to concatenate each line to a single string.  Something like
>
> [2,] "y_{01}(k-001)" ""  -> [2,] "y_{01}(k-001)"
>
> [11,] "y_{01}(k-001)" "u_{01}(k-001)" -> [11,]
> "y_{01}(k-001)*u_{01}(k-001)"
>
>
> Is there a way to do it without going through every column?
>
> Many thanks
>
> Ed
>
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>
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