Re: [R] variables in object names

From: Pierce, Ken <ken.pierce_at_oregonstate.edu>
Date: Tue 12 Sep 2006 - 20:37:01 GMT


Thanks to all who showed me to the get() function. That works like a charm.  

Ken


From: David Barron [mailto:mothsailor@googlemail.com] Sent: Tuesday, September 12, 2006 1:24 PM To: Pierce, Ken; r-help
Subject: Re: [R] variables in object names

The trick is to use the function get():

> vns <- paste("model",1:4,sep="")
> x <- rnorm(10)
> model1 <- lm(rnorm(10) ~ x)
> model2 <- lm(rnorm(10) ~ x)
> model3 <- lm(rnorm(10) ~ x)
> model4 <- lm(rnorm(10) ~ x)

> r.sq <- summary(model1)$r.square
> for (i in 2:4) r.sq <- c(r.sq,summary(get(vns[i]))$r.square)

On 12/09/06, Pierce, Ken <ken.pierce@oregonstate.edu> wrote:

        Is there any way to put an argument into an object name. For example,

        say I have 5 objects, model1, model2, model3, model4 and model5.         

        I would like to make a vector of the r.squares from each model by code

        such as this:                  

	rsq <- summary(model1)$r.squared
	for(i in 2:5){
	rsq <- c(rsq, summary(model%i%)$r.squared)
	}
	
	
	So I assign the first value to rsq then cycle through models 2
through 5
	gathering there values. The %i% in my third line indicates which
object 
	to draw from. The question is is there any way to pass a
variable such
	as i as part of a name?
	
	Ken
	
	
	
	Kenneth B. Pierce Jr.
	
	Research Ecologist
	
	Landscape Ecology, Modeling, Mapping and Analysis Team 
	
	PNW Research Station - USDA-FS
	
	3200 SW Jefferson Way,  Corvallis,  OR 97331
	
	ken.pierce@oregonstate.edu
	
	541 750-7393
	
	http://www.fsl.orst.edu/lemma/gnnfire
	
	
	
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-- 
=================================
David Barron
Said Business School
University of Oxford 
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Oxford OX1 1HP 

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Received on Wed Sep 13 11:51:53 2006

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