[Coin-discuss] OsiClp/Clp initialSolve

[Matthew Saltzman]

On Mon, 10 Oct 2005 Jan-Willem.Goossens at nc3a.nato.int wrote:

> Hi again,
>
> Thanks for the quick reply and code change!
>
>
> After updating, I saw this in Coin/CoinFileIO.cpp (Rev 1.3) :
>
> char * environ = getenv("HOME");			(line 592)
>
> This causes a problem (at least on my windows machine), because stdlib.h
> contains a macro def called   environ

Which compiler, which version?

> Just changing the name environ into something else solves this.

Just as a point of information, ANSI/ISO stdlib.h should not define this 
symbol.  But it would probably be better to use something else, as it 
was commonly provided in older *NIX and Windows compilers.

I've changed the name of the variable to home_dir.

>
>
> Jan-Willem
>
>
>
> -----Original Message-----
> From: coin-discuss-bounces at list.coin-or.org
> [mailto:coin-discuss-bounces at list.coin-or.org] On Behalf Of John J
> Forrest
> Sent: 07 October 2005 22:46
> To: Discussions about open source software for Operations Research
> Subject: Re: [Coin-discuss] OsiClp/Clp initialSolve
>
>
>
> Your wish is my command.
>
> If the user has not set any hints (apart from reducing printout) and if
> there is an all slack basis OsiClp will do a ClpSimplex::initialSolve
> with some of the more exotic possibilities switched off.
>
>
> <Jan-Willem.Goossens at nc3a.nato.int>
> Sent by: coin-discuss-bounces at list.coin-or.org
> 10/07/2005 09:20 AM Please respond to
> Discussions about open source software for Operations Research
>
> To<coin-discuss at list.coin-or.org>
> cc
> Subject[Coin-discuss] OsiClp/Clp initialSolve
>
>
>
>
>
>
>
> Hi all,
>
> I noticed that solving some LPs through OsiClp takes longer than solving
> them with Clp (simple initialSolve), without any Hints set. From what I
> can see, there is quite some code in the OsiClp initialSolve, e.g. to
> see whether or not to use primal/dual simplex etc.
> Wouldn't it be a good idea for OsiClp initialSolve to rely more on Clp's
> logic here, at least in no-hints/automatic mode? Or am I seeing this the
> wrong way?..
>
> Thanks,
>
> Jan-Willem Goossens
>
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-- 
 		Matthew Saltzman

Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs