Re: MPS format, Linear Programming, and Optimization'MPSData

*To*: mathgroup at smc.vnet.net*Subject*: [mg51767] Re: MPS format, Linear Programming, and Optimization'MPSData*From*: motz art <music at heart.com>*Date*: Mon, 1 Nov 2004 02:53:00 -0500 (EST)*References*: <cm228a$gfb$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Useful link? http://www.lionhrtpub.com/orms/orms-12-03/frswr.html On Sun, 31 Oct 2004 06:55:06 +0000 (UTC), frankeye at cox.net (Frank Iannarilli) wrote: >Some time ago, a post asked about benchmarking LP problems in Mathematica. I >suggested he find standard problems described in MPS format and import >them. MPS is Mathematical Programming System format, and Mathematica 5 >reportedly imports this format (MPS can be either Mathematica >PostScript or the MPS I'm discussing; Mathematica supposedly disambiguates the >two -- however, see MPSData format below). > >Unfortunately, AFAIK, there's no real documentation to speak of within >Mathematica or at the Wolfram site. Thankfully, I came across an "OR/MS >Today" article (December 2003), a review of Mathematica 5 which has all the >goods. (One can Google to find it). I'll reproduce the essentials >below: > > ><< "Optimization`MPSData`" >p = Import["boeing1.mps", "MPSData"]; > out=MPSData[BOEING1, {351, 384}, <>] >{c, a, b, d} = ToLinearProgrammingData[p]; >xo = LinearProgramming[c, a, b, d, Method -> "InteriorPoint"]; > > here's the optimal value: >c.xo > out=-335.214 > >Nice! > >But I've never come across any word of the Optimization`MPSData >package. What other goodies lurk?? > >---- > >PS - the boeing1.mps datafile along with others can be found at >www.netlib.org, under the lp/data directory. See the readme file >there. All the MPS files there are compressed in a homemade format, >that can be decompressed by using their emps.exe (or build it from .c) >program, which is also located there.