Hi Manuel,

try this combination of paste(), which collapse your variables into a 
single one, and cbind() for binding this new variable with the others of 
your initial data frame

mat=as.data.frame(matrix(1:18,3,6))
mat2=cbind(newV=with(mat,paste(V1,V2,V3,V4,sep="")),mat[,5:6])

is it what you wanted?

cheers,
Pierre

PS: this kind of questions should go into general R help list

Le 27/03/2013 14:15, Manuel Spínola a écrit :
> Thank you very much to all that answered my question, some one of you asked
> me to be more specific, here is my question again:
>
> I hava a data frame:
>
> col1  col2 col3 col4 col5 col6
> 0        1      1     0     a    c
> 1        0      0     0     a    d
> 0        1      1     1     b    d
>
> I want to end with a data frame like this (the first 4 columns without
> space):
>
> 0110     a    c
> 1000     a    d
> 0111     b    d
>
>
> Best,
>
> Manuel
>
>
>
> 2013/3/26 Roman LuÅ¡trik <roman.lustrik@gmail.com>
>
>> How do you want to remove the space, so that when you print a data frame
>> that the columns are closer together? Pr perhaps you're trying to merge
>> column names into a single string? Perhaps something third? Can you expand
>> your answer?
>>
>> Cheers,
>> Roman
>>
>>
>>
>> 2013/3/27 Manuel SpÃ­nola <mspinola10@gmail.com>
>>
>>> Dera list members,
>>>
>>> How to remove spaces among columns in a data frame.
>>>
>>> 1 2 3 4  to become 1234
>>>
>>> Best,
>>>
>>> Manuel
>>>
>>> --
>>> *Manuel SpÃ­nola, Ph.D.*
>>>
>>> Instituto Internacional en ConservaciÃ³n y Manejo de Vida Silvestre
>>> Universidad Nacional
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>>> COSTA RICA
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>>> mspinola10@gmail.com
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>>> Fax: (506) 2237-7036
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>>> https://sites.google.com/site/lobitoderio/>
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>>>
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>>>
>>>
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>>>
>>
>> --
>> In God we trust, all others bring data.
>>
>
>
>
>
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