[ADMB Users] FW: [Developers] FW: ADMB-RE

[Mark Maunder]

For your info
From: dave fournier [mailto:davef at otter-rsch.com]
Sent: Sunday, October 23, 2011 4:46 PM
To: Mark Maunder
Cc: developers at admb-project.org
Subject: Re: [Developers] FW: ADMB-RE

On 11-10-23 04:07 PM, Mark Maunder wrote:


When I developed ADMB Griewank wanted me to make the copy constructor for
dvariables to be a deep copy. This introduced all kinds of technical difficulties
(hence the exestence of prevariables). It did not seem to have any real advantage.
So for df1b2variables I went back to shallow copies. The only thing you need to
lnow is that as you discovered

    df1b2variable x =y;

means that x and y are the same.  This is already the case for dvar_vectors.

See below

From: Richard Bian [mailto:r.bian at niwa.co.nz]
Sent: Sunday, October 23, 2011 2:49 PM
To: Mark Maunder
Subject: ADMB-RE

Hi Mark,

When I code my model, I noticed something interesting in ADMB-RE. Assuming x is a dvariable, if I declare another dvariable y this way, dvariable y=x; then when I change y, x will be changed in the RE round, but not in ordinary ADMB round. I guess when ADMB-RE converts the tpl to cpp in the df1b2_parameters functions, it declares y as x's reference rather than an normal variable. I didn't see this mentioned in the manual, so I think I'd let you know about this.


Regards,
Richard


Richard Bian
National Institute of Water & Atmospheric Research
41 Market Place
Auckland Central 1010, New Zealand
Tel: +64 9 375 2054  Fax: +64 9 375 2051


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