From ripley@stats.ox.ac.uk  Tue Mar  5 21:32:36 2002
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Tue, 5 Mar 2002 22:32:36 +0100 (MET)
Subject: [Rd] Matrix identification bug (PR#1361)
Message-ID: <200203052132.WAA08217@pubhealth.ku.dk>

On Tue, 5 Mar 2002 hyu@stats.uwo.ca wrote:

> Full_Name: Hao Yu
> Version: 1.4.1
> OS: Windws and Linux
> Submission from: (NULL) (129.100.45.161)

[...]

> the result was (PIII Xeon 1GHz RedHat 7.2 Linux))
> > system.time(solve.Matrix(Toeplitz(.5^seq(0,999))))
> [1] 9.76 0.22 9.97 0.00 0.00
>
> Clearly there are some bugs in solve() and solve.Matrix(). Notice that all have

Nothing in this report suggests a bug in solve().  Can you please provide
some evidence for your claim (which is not `clear' to me), and

> solve
function (a, b, ...)
UseMethod("solve")

seems hard to get wrong!  (It matters: solve is part of R: solve.Matrix is
a contributed addon.)

Incidentally, these sort of timings are crucially dependent on the BLAS
library used, and in my experience that is a far larger factor that the OS
used.  However, that was not part of the report ....

-- 
Brian D. Ripley,                  ripley@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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[Rd] Matrix identification bug (PR#1361)
ripley@stats.ox.ac.uk