Subject: Re: aov-related segfault (PR#382)
From: Prof Brian Ripley (email@example.com)
Date: Wed 22 Dec 1999 - 21:42:53 EST
On Mon, 20 Dec 1999 firstname.lastname@example.org wrote:
> This crashes the development version, but apparently also earlier versions
> (a typo of course, but still shouldn't happen)
> aov(response~dag+Error(person/dag/response)) # error from model.matrix.default
> gc() # *poof*...
1) This is nothing specific to aov. It can be repoduced by
response <- rnorm(60)
dag <- gl(3,2,60)
model.matrix(formula = response ~ dag/response)
2) The crash occurs because a 60x3 (rather than 60x6) matrix is allocated,
so lots of writing outside the matrix occurs.
3) model.matrix(~ dag + response:dag) works, but has a slightly different
4) S generates a 60x5 matrix, which looks wrong to me.
-- Brian D. Ripley, email@example.com 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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