[R] reshaping a dataset for a network

[Marco Guerzoni]

Il 3/14/2012 4:43 PM, William Dunlap ha scritto:
> I see you have a solution, but why do you want the
> results of split() in matrix form?  E.g., does it make
> a nicer printout, is it needed to interface with other
> R functions, is it needed to interface with other
I need matrix to export the data in to pajek. I don't any other way to 
have them like this and save them as text file.
Probably is my lack of knowledge...

> software?
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
>
>> -----Original Message-----
>> From: Marco Guerzoni [mailto:marco.guerzoni at unito.it]
>> Sent: Wednesday, March 14, 2012 1:02 AM
>> To: William Dunlap
>> Cc: r-help at r-project.org
>> Subject: Re: [R] reshaping a dataset for a network
>>
>> Thank you fro the reply.
>> I managed to arrive till here, then I would like to have it in matrix
>> where the $1 $2...$5 are the first column.
>>
>> Il 3/13/2012 8:15 PM, William Dunlap ha scritto:
>>> Is the following what you want?
>>>     >   a<- c(1,2,3,4,4,4,5,5)
>>>     >   b<- c(11,7,4,9,8,3,12,4)
>>>     >   split(b, a)
>>>     $1
>>>     [1] 11
>>>
>>>     $2
>>>     [1] 7
>>>
>>>     $3
>>>     [1] 4
>>>
>>>     $4
>>>     [1] 9 8 3
>>>
>>>     $5
>>>     [1] 12  4
>> Here I did
>>
>> c<- split(b, a)
>> d<- do.call(rbind,c)
>>
>> and I get
>>
>>     [,1] [,2] [,3]
>> 1   11   11   11
>> 2    7    7    7
>> 3    4    4    4
>> 4    9    8    3
>> 5   12    4   12
>>
>>
>> Instead of what I would like:
>>
>>     [,1] [,2] [,3]
>> 1   11
>> 2    7
>> 3    4
>> 4    9    8    3
>> 5   12    4
>>
>> A solution could be rbind.fill , which does not seem to work with list.
>>
>>
>> thanks
>> Marco Guerzoni,
>> Department of Economics
>> University of Turin
>>
>>
>>> Note that your df<-cbind(a,b) produces a matrix, not the data.frame
>>> that your df suggests you want.  Use df<-data.frame(a,b) to make
>>> a data.frame.  Then you could do with(df, split(a,b)) to operate on
>>> the a and b in the data.frame df.
>>>
>>> Bill Dunlap
>>> Spotfire, TIBCO Software
>>> wdunlap tibco.com
>>>
>>>
>>>> -----Original Message-----
>>>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
>> Behalf
>>>> Of Marco Guerzoni
>>>> Sent: Tuesday, March 13, 2012 10:51 AM
>>>> To: r-help at r-project.org
>>>> Subject: [R] reshaping a dataset for a network
>>>>
>>>> dear all,
>>>> apologizes for bothering with a probably stupid question but I really
>>>> don' t know how to proceed.
>>>>
>>>> I have a dataset which look like df
>>>>
>>>> a<- c(1,2,3,4,4,4,5,5)
>>>> b<- c(11,7,4,9,8,3,12,4)
>>>> df<-cbind(a,b)
>>>>
>>>> I would like to have one which looks like this:
>>>>
>>>> a
>>>> 1 11
>>>> 2 7
>>>> 3 4
>>>> 4 9 8 3
>>>> 5 12 4
>>>>
>>>> a are vertex of a network, b the edges. In the data the lenght of a is
>>>> about 50000
>>>>
>>>> I read several posts about reshape, reshape2, split, ldply but I
>>>> couldn't manage to do it. The problem seems to be that the is not a real
>>>> panel.
>>>>
>>>> Any help would be really appreciated,
>>>> my best regards
>>>> Marco
>>>>
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