Re: [R] inserting zero instances with zeroes in a matrix

[Simon Pickett]

Actually,

Both these solutions create contingency tables, with frequency rather than 
the original count values. Is there a way to retain the original count 
values?

Thanks again, Simon.


----- Original Message ----- 
From: "Simon Pickett" <simon.pick...@bto.org>
To: "Gabor Grothendieck" <ggrothendi...@gmail.com>; "Henrique Dallazuanna" 
<www...@gmail.com>
Cc: <r-help@r-project.org>
Sent: Thursday, December 18, 2008 12:11 PM
Subject: Re: [R] inserting zero instances with zeroes in a matrix


Thanks Gregor and Henrique for the eloquent and masterful replies,

These solutions have saved me hours (maybe even days) of work in the 
future,
I am very grateful. :-)

Simon.


----- Original Message ----- 
From: "Gabor Grothendieck" <ggrothendi...@gmail.com>
To: "Henrique Dallazuanna" <www...@gmail.com>
Cc: "Simon Pickett" <simon.pick...@bto.org>; <r-help@r-project.org>
Sent: Thursday, December 18, 2008 11:51 AM
Subject: Re: [R] inserting zero instances with zeroes in a matrix


Try this:

as.data.frame(xtabs(count ~., d.f))


On Thu, Dec 18, 2008 at 6:25 AM, Henrique Dallazuanna <www...@gmail.com> 
wrote:
Try this:

with(d.f,
   {merge(data.frame(house = rep(unique(house), each =
length(unique(pet))),
            pet = unique(pet)), d.f, by = c("house", "pet"), all = TRUE)
     }
    )

On Thu, Dec 18, 2008 at 8:58 AM, Simon Pickett 
<simon.pick...@bto.org>wrote:

Hi all,

Suppose I had the below example where a survey was carried out 
recording
the number of each type of pet in each house

count<-c(2,1,2,1,2,3,4)
house<-c("house1","house1","house2","house3","house4","house4","house4")
pet<-c("dogs","cats","dogs","dogs","budgie","cat","hamster")
d.f<-data.frame(house,pet,count)

How would I acheive a dataframe that had every instance of house in 
column
1, all possible pets in column 2 and counts in column 3 like this...

newhouse<-rep(unique(house),1,each=4)
newpets<-rep(unique(pet),4)
newcount<-c(2,1,0,0,2,0,0,0,1,0,0,0,0,3,2,4)
newdf<-data.frame(newhouse,newpets,newcount)

Is there a way of doing this without creating a new matrix and using
programming loops?

Thanks in advance, Simon.



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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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______________________________________________
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PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.



______________________________________________
R-help@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.