Hi once again.
 just to let you know that i found the answer i need:
http://www.mail-archive.com/r-help@r-project.org/msg65359.html

Thank you once more.
Cláudio

2010/4/24 Cláudio Sá <c0870224@alunos.fc.up.pt>

> Thank you for the quick answer, but i was asking if some method could do
> combinations where numbers of the same vector wont combine.
> A little bit like 'expand.grid', but with the possibility to choose the
> length for output combinations.
>
> Cláudio
>
> 2010/4/23 Jorge Ivan Velez <jorgeivanvelez@gmail.com>
>
> Hi Cláudio,
>>
>> Try this:
>>
>> require(gtools)
>> combinations(10, 2)
>> combinations(10, 2, repeats = TRUE)
>>
>> HTH,
>> Jorge
>>
>>
>> 2010/4/23 Cláudio Sá <>
>>
>>> Hi!
>>>
>>>  Is there any easy/fast way to combine vectors with restrictions?
>>>
>>> Example:
>>>
>>> a=c(1,2,3), b=c(4,5,6), c=c(7,8,9)
>>>
>>> I want all combinations of this 3 vectors with length=2.
>>>
>>> Like this:
>>> 1,4
>>> 1,5
>>> 1,6
>>> 1,7
>>> 1,8
>>> 1,9
>>> 2,4
>>> 2,5
>>> 2,6
>>> 2,7
>>> ... and so on.
>>>
>>> Thanks in advance.
>>>
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>>>
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>>
>>
>

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