[OS] OSnl2osil

[Kipp Martin]

Hi Susana:
> 
> I would be very interested if you could include this feature in your sofware.

We have had this on the to do list for quite some time. Hopefully, it 
will get done in the near future.
> 
> I wrote a code with your cpp OSInstace in which the variables are discretized in time, the Goddard Rocket problem. I was wondering if you would be interested in it as an example to put it in your Coin-or web page.   

I am very interested in your example and would love to see it.

Is there a link we can put in on our Web Page to your code, or would you 
like the code put on a COIN-OR server.  COIN-OR is strict about code 
that goes on its server and you would need to have a form signed by your 
employer giving permission to host the code.  Let me know if you are 
interested in going this route, but in any case I would love to see the 
code.

Thanks



> 
> Regards,
> 
> Susana.
> 
> 
> 
> ----- Original Message -----
> From: "Kipp Martin" <Kipp.Martin at chicagogsb.edu>
> To: os at list.coin-or.org
> Sent: Monday, February 25, 2008 6:04:00 PM (GMT) Africa/Casablanca
> Subject: [OS] OSnl2osil
> 
> Hi Susana:
> 
> By the way, any email I try to send to you directly is getting bounced back.
> 
> I just tried to run your AMPL model and the result I get is below. As 
> you can see the OSResult file contains error message below:
> 
> 
> <message>OS cannot handle AMPL user defined variables, please reformulate
> </message>
> 
> so it appears you are using "user defined variables" which at this time 
> we don't support. For example you have
> 
> var q{i in 0..n} = 1.0 + f[i]*cos(L[i]) + g[i]*sin(L[i]);
> 
> so variable q depends on variables f an g and is defined in terms of them.
> 
> See, for example,
> 
> 
> http://www.gerad.ca/~orban/drampl/def-vars.html
> 
> 
> I realize that this is a convenient feature that users want. We do hope 
> to put this feature in.
> 
> My apologies for now.
> 
> Regards,
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> <?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type = "text/xsl" 
> href = "../stylesheets/OSrL.xslt"?><osrl 
> xmlns="os.optimizationservices.org" 
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
> xsi:schemaLocation="os.optimizationservices.org 
> http://www.optimizationservices.org/schemas/OSrL.xsd" >
> <resultHeader>
> <generalStatus type="error"/>
> <message>OS cannot handle AMPL user defined variables, please 
> reformulate</message>
> </resultHeader>
> <resultData>
> </resultData>
> </osrl>
> 


-- 
Kipp Martin
Professor of Operations Research
and Computing Technology
Graduate School of Business
University of Chicago
5807 South Woodlawn Avenue
Chicago, IL 60637
773-702-7456
kipp.martin at chicagogsb.edu
http://gsbkip.chicagogsb.edu
http://www.coin-or.org