[R] problem using MASS corresp and mca functions

[Alexandre Fayolle]

Hello,

I'm an absolute beginner with R and neophite in data analysis, so please bear
with me if I ask stupid question. 

I'm trying to do a correspondence analysis using R and MASS corresp function,
but I get an error message which I'm unable to interpret:

> data(weblog)
> library(MASS)
> corresp(~ url + fromurl, data=weblog)
Error in svd(t(t(x1 * Dr) * Dc)) : error  306  in dsvdc

Similarly, I get another error if I try to use mca:
> mca(weblog)
Error in (rep(1, n)) %*% G : non-conformable arguments

I'm a bit stuck there, with the impression that I'm missing something
fundamental. 

The data I'm using is a csv file extracted from an web server logfile. The first
lines are:
visitor;date;url;fromurl;agent
61.133.139.118;05/Nov/2000:04:02:08;/img/main_window.gif;http://www.logilab.org/sshots.html;Teleport
61.133.139.118;05/Nov/2000:04:02:16;/contact.html;http://www.logilab.org/dev.html;Teleport
<snip>

Any help or comment is welcome.

Alexandre Fayolle
--
http://alexandre.fayolle.free.fr
http://www.logilab.org
Narval is the first software agent available as free software (GPL).
LOGILAB, Paris (France).

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