[R] question

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Fri Aug 2 20:20:03 CEST 2002

On Fri, 2 Aug 2002, Saket Joshi wrote:

> Hi all,
> I am running R1.5.0 on Unix.
> I fitted a tree model my.tree on some data my.data and the tree has only 2
> leaves. Now I have some test data new.data
> When I run
> predict(my.tree, new.data)
> it does give a reasonable answer but it takes 60 to 90 seconds to come up
> with the answer.
> I had expected it to take far less than that considering that the predict
> function has just to traverse a tree with 2 nodes and give the answer.
> Could anyone tell me why this function is taking so much time to run?

Not on the amount of information you have given.  Take a look at
`Writing R Extensions' or an earlier Programmers' Niche in R-news for how
to profile your run to see where the time is being spent.

Brian D. Ripley,                  ripley at 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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