[R] How to built a pivot table of value

[John Kane]

Blast, you're right. I tend to load both at the same time and confused the two.  It should be reshape2

John Kane
Kingston ON Canada


> -----Original Message-----
> From: bhh at xs4all.nl
> Sent: Sat, 1 Dec 2012 15:20:13 +0100
> To: jrkrideau at inbox.com
> Subject: Re: [R] How to built a pivot table of value
> 
> 
> On 01-12-2012, at 14:56, John Kane wrote:
> 
>> One way, using the plyr package would be:
>> 
>> library(plyr)
>> dcast(base, p ~  q)
>> 
> 
> Shouldn't that be library(reshape2) ?
> 
> Berend
> 
>> John Kane
>> Kingston ON Canada
>> 
>> 
>>> -----Original Message-----
>>> From: ce.kaya75 at yahoo.fr
>>> Sent: Sat, 1 Dec 2012 04:37:02 -0800 (PST)
>>> To: r-help at r-project.org
>>> Subject: [R] How to built a pivot table of value
>>> 
>>> Hi R users
>>> 
>>> Imagine the table "base":
>>> p=c("d","d","b","b","a","a")
>>> q=c("v1","v2","v1","v2","v1","v2")
>>> r=c(5,2,4,8,9,7)
>>> base=data.frame(p,q,r)
>>> base
>>> 
>>>    p   q     r
>>> 1  d   v1   5
>>> 2  d   v2   2
>>> 3  b   v1  4
>>> 4  b   v2   8
>>> 5  a   v1   9
>>> 6  a   v2   7
>>> 
>>> How programming R to get this result:
>>> 
>>>            v1   v2
>>> a          9        7
>>> b         4        8
>>> d         5        2
>>> 
>>> I tried the function table but the result is divided in several matrix:
>>> table(base$p,base$q,base$r)
>>> , ,  = 2
>>> 
>>> 
>>>   v1 v2
>>> a  0  0
>>> b  0  0
>>> d  0  1
>>> 
>>> , ,  = 4
>>> 
>>> 
>>>   v1 v2
>>> a  0  0
>>> b  1  0
>>> d  0  0
>>> 
>>> , ,  = 5
>>> 
>>> 
>>>   v1 v2
>>> a  0  0
>>> b  0  0
>>> d  1  0
>>> 
>>> , ,  = 7
>>> 
>>> 
>>>   v1 v2
>>> a  0  1
>>> b  0  0
>>> d  0  0
>>> 
>>> , ,  = 8
>>> 
>>> 
>>>   v1 v2
>>> a  0  0
>>> b  0  1
>>> d  0  0
>>> 
>>> , ,  = 9
>>> 
>>> 
>>>   v1 v2
>>> a  1  0
>>> b  0  0
>>> d  0  0
>>> 
>>> SIncerely yours
>>> 
>>> 
>>> 
>>> --
>>> View this message in context:
>>> http://r.789695.n4.nabble.com/How-to-built-a-pivot-table-of-value-tp4651539.html
>>> Sent from the R help mailing list archive at Nabble.com.
>>> 
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>> 
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>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.

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