R help - Aug 2011 - Concatenate two strings in one in a string matrix

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

	[[alternative HTML version deleted]]

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
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

On Aug 18, 2011, at 2:35 PM, Eduardo Mendes wrote:
> Dear R-Users
>
> I have the following matrix
>
>> out$desc      [,1]            [,2]
> [1,] ""              ""
> [2,] "y_{01}(k-001)" ""
> [3,] "y_{01}(k-002)" ""
> [4,] "y_{01}(k-003)" ""
> [5,] "u_{01}(k-001)" ""
> [6,] "u_{01}(k-002)" ""
> [7,] "u_{01}(k-003)" ""
> [8,] "y_{01}(k-001)" "y_{01}(k-001)"
> [9,] "y_{01}(k-001)" "y_{01}(k-002)"
> [10,] "y_{01}(k-001)" "y_{01}(k-003)"
> [11,] "y_{01}(k-001)" "u_{01}(k-001)"
>
>
> and need to concatenate each line to a single string.  Something like
>
> [2,] "y_{01}(k-001)" ""  -> [2,]
"y_{01}(k-001)"
>
> [11,] "y_{01}(k-001)" "u_{01}(k-001)" -> [11,]
"y_{01}(k-001)*u_{01}
> (k-001)"
>
> Is there a way to do it without going through every column?
apply(out$desc, 1, paste, collapse="")

It is ambiguous what you want for a delimiter. In one case you used  
"", and another you used "*". I used "".


-- 

David Winsemius, MD
West Hartford, CT