Your data objects could not be matrices with that composition of values. Let's use the correct data type:

> df <- data.frame(Ind = letters[1:4], val = sample(1:4, 4))
> df
  Ind val
1   a   4
2   b   2
3   c   3
4   d   1
> rbind(cbind(df,"GruppeEin"),cbind(df,"GruppeZwei")) #v ariable recycling
  Ind val          y
1   a   4  GruppeEin
2   b   2  GruppeEin
3   c   3  GruppeEin
4   d   1  GruppeEin
5   a   4 GruppeZwei
6   b   2 GruppeZwei
7   c   3 GruppeZwei
8   d   1 GruppeZwei

> is.data.frame(rbind(cbind(df,"GruppeEin"),cbind(df,"GruppeZwei")))
[1] TRUE

--
David Winsemius

On Mar 3, 2009, at 8:53 AM, Usuario R wrote:

Hi all,

I would like to transform to long format a matrix  which has only
information about individuals and a value for each individual. I would like to have it in ling format with more information related to groups, so ell values and individuals are repeated for each group. Let me show the example:

matrix in wide format:

Individuals    Value
A    3
B    4
C    5
D    2

And long format would be like:

Individuals    Value    Group
A    3    Group1
B    4    Group1
C    5    Group1
D    2    Group1
A    3    Group2
B    4    Group2
C    5    Group2
D    2    Group2

My case is of course very large so i thought this could be possible with
reshape function by adding a vector with the names of the groups or
something like that.

Thanks in advance.

        [[alternative HTML version deleted]]

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