From ripley@stats.ox.ac.uk  Thu Jun  8 20:32:46 2000
From: ripley@stats.ox.ac.uk (Prof Brian D Ripley)
Date: Thu, 8 Jun 2000 20:32:46 +0100 (BST)
Subject: [Rd] creating models from "Objects" in R's environment
In-Reply-To: <Pine.GSO.4.10.10006081350200.11509-100000@icarus.cc.uic.edu>
Message-ID: <Pine.GSO.4.05.10006082028520.27560-100000@auk.stats>

On Thu, 8 Jun 2000, Cheryl J Fernandes wrote:

> Hi
>   I'm trying to create Tree based models in R using the downloadable
> package called "tree".
> 
>   It is mentioned in the R documentation that Objects are created and 
> stored in the R environment by name.
> 
> So I have saved all the objects formed during the creation of a tree model
> using the R command:
> 
> dump(objects(),"Z:\\Project\\Exammples\\Output\\outputTree.txt");
> 
[..]

> Here's a snapshot of the output file outputTree.txt:

> After creating the models, one needs to analyse them with some new data.
> Hence, I am now trying to analyze this model with a new set of data.
> 
> Is it possible in R to recreate the models by reading from the "Object"
> output file.

Eveything is possible in R: you can program a Turing machine in it
but you might need unlimited memory.

> ie By reading from the above displayed file, can we recreate the tree
> model ??

Yes, but to fit the *formula* to a new dataset (hence a *new* model) you
will need to use update.

I suggest you use save() not dump() to store objects.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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[Rd] creating models from "Objects" in R's environment
Prof Brian D Ripley