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

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