Re: [R] variables in object names

From: David Barron <mothsailor_at_googlemail.com>
Date: Tue 12 Sep 2006 - 20:24:05 GMT

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
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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>

-- 
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP

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Received on Wed Sep 13 07:48:21 2006

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