[R] Data manipulation

[John Kane]

What zero values?  And are they acutall zeros or are the NA's, that is, missing values?

The code looks okay but without some sample data it is difficult to know exactly what you are doing. 

The easiest way to supply data  is to use the dput() function.  Example with your file named "testfile": 
dput(testfile) 
Then copy the output and paste into your email.  For large data sets, you can just supply a representative sample.  Usually, 
dput(head(testfile, 100)) will be sufficient.   

 http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

Please supply some sample data. 
 

John Kane
Kingston ON Canada


> -----Original Message-----
> From: ii54250 at msn.com
> Sent: Fri, 15 Mar 2013 12:40:54 +0000
> To: r-help at r-project.org
> Subject: [R] Data manipulation
> 
> Hello all,
> 
> 
> 
> I would appreciate your thoughts on a seemingly simple problem. I have a
> database, where each row represent a single record. I want to aggregate
> this
> database so I use the aggregate command :
> 
> 
> 
> D<-read.csv("C:\\Users\\test.csv")
> 
> 
> 
> attach(D)
> 
> 
> 
> by1<-factor(Class)
> 
> by2<-factor(X)
> 
> W<-aggregate(x=Count,by=list(by1,by2),FUN="sum")
> 
> 
> 
> The results I get following the form:
> 
> 
> 
> >W
> 
>   Group.1 Group.2 x
> 
> 1       1     0.1 4
> 
> 2       2     0.1 7
> 
> 3       3     0.1 1
> 
> 4       1     0.2 3
> 
> 5       3     0.2 4
> 
> 6       3     0.3 4
> 
> 
> 
> 
> 
> However, what I really want is an aggregation which includes the zero
> values, i.e.:
> 
> 
> 
> >W
> 
>   Group.1 Group.2 x
> 
> 1       1     0.1 4
> 
> 2       2     0.1 7
> 
> 3       3     0.1 1
> 
> 4       1     0.2 3
> 
>         2     0.2 0
> 
> 5       3     0.2 4
> 
> 1        0.3 0
> 
> 2        0.3 0
> 
> 6       3     0.3 4
> 
> 
> 
> 
> 
> How can I achieve what I want?
> 
> 
> 
> Best regards,
> 
> Ioanna
> 
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.

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