[R] different results from nls in 2.10.1 and 2.11.1

[Prof. John C Nash]

Interesting!
I get nice convergence in both 32 and 64 bit systems on 2.13.0. I agree the older versions
are a bit of a distraction. The inconsistent behaviour on current R is a concern.

Maybe Philip, Uwe, and I (and others who might be interested) should take this off line
and see what is going on. I'll offer to act as tabulator of results and have set up a
temporary wiki on

http://macnash.telfer.uottawa.ca/PBettProb

to allow tries to be saved for comparison. Needs a login to "write". Please use
username=Ruser
password=statistics

Hopefully there won't be wikispam, or I'll have to close it off.

JN


On 06/20/2011 06:00 AM, r-help-request at r-project.org wrote:
> Date: Mon, 20 Jun 2011 11:25:54 +0200
> From: Uwe Ligges <ligges at statistik.tu-dortmund.de>
> To: p.e.bett at dunelm.org.uk
> Cc: r-help at r-project.org, Philip Bett <pbett at astro.uni-bonn.de>
> Subject: Re: [R] different results from nls in 2.10.1 and 2.11.1
> Message-ID: <4DFF1222.7040202 at statistik.tu-dortmund.de>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Since one is a 32-bit and the other one a 64-bit, and therefore the 
> compiler is also different, you can get different numerical results 
> easily, even with identical versions of R (and most of us do not have 
> outdated R installations around).
> 
> I just tried your example on 3 different systems with R-2.13.0 and all 
> told me "singular convergence"...
> 
> Uwe Ligges
> 
>