From david_m_potter@groton.pfizer.com  Fri Nov  5 18:10:24 1999
From: david_m_potter@groton.pfizer.com (david_m_potter@groton.pfizer.com)
Date: Fri, 5 Nov 1999 19:10:24 +0100 (MET)
Subject: rpart problem (PR#313)
Message-ID: <199911051810.TAA14930@pubhealth.ku.dk>

* * * Just the Facts * * *
call to rpart() with a factor response gives
the error message:

"Error: first argument is array, but not matrix."

* * * Example Code * * * 
==============================================
R : Copyright 1999, The R Development Core Team
Version 0.65.1 Release (October 07, 1999)

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> library(rpart)
> x _ 1:50
> y _ as.factor(rbinom(50,1,.5))
> fit _ rpart(y~x,method="class")
Error: first argument is array, but not matrix.
> 

* * * Version Information * * *
==============================================

--please do not edit the information below--

Version:
 platform = sparc-sun-solaris2.6
 arch = sparc
 os = solaris2.6
 system = sparc, solaris2.6
 status = Release
 major = 0
 minor = 65.1
 year = 1999
 month = October
 day = 07
 language = R

Search Path:
 .GlobalEnv, package:rpart, Autoloads, package:base


* * * Unsolicited Hypothesis * * * 

In rpart(), I believe this line causes the error message:

        temp <- rp$dnode[, -(1:3)] %*% diag(init$parms[1:numclass] *
nobs/init$counts)

Thanks for your attention.

David


David M. Potter
Mathematical & Statistical Sciences
Pfizer Central Research
PO Box 8003/832
Groton, CT 06340-8003
Tel 860-715-1769 ; Fax 860-715-5445
potterdm@groton.pfizer.com


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rpart problem (PR#313)
david_m_potter@groton.pfizer.com