Re: [R] Help in Compliling user -defined functions in Rpart

From: Prof Brian Ripley <>
Date: Sat 27 Aug 2005 - 03:44:01 EST

On Fri, 26 Aug 2005, Luwis Tapiwa Diya wrote:

> I have been trying to write my own user defined function in Rpart.I
> imitated the anova splitting rule which is given as an example.In the
> work I am doing ,I am calculating the concentration index(ci) ,which
> is in between -1 and +1.So my deviance is given by
> abs(ci)*(1-abs(ci)).Now when I run rpart incorporating this user
> defined function i get the following error message:
> Error in user.split(yback[1:nback], wback[1:nback], xback[1:nback], parms, :
> unused argument(s) ( ...)
> Now I am failing to indentify where I am going wrong (In case I am
> have made some mistake).So I was wondering if there is anybody who
> have written some user defined functions of theirs and maybe if there
> is any documentation with regards to user defined functions and
> examples.

There is a commented example in the tests directory (of the sources).

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Sat Aug 27 03:54:00 2005

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