Hi Reginald, thank you for pointing me to that script. I took a look, and if I will run out of time I will definitely use it. The program is really cpu intensive and the alignment part is an intermediate result, so I will still try to use the library. dumping formatted data to disk and running another program would mean to wrap everything in a script and break my original program into two parts. still it's an option... thanks for your help, alessandro
On Jan 14, 2013, at 2:34 PM, Reginald Beardsley <[email protected]> wrote: > Alessandro, > > If you look here: > > http://en.wikibooks.org/wiki/GLPK/Unix_Batch_Execution > > at script tst2a, you'll see an example of generating MathProg data files in a > *nix command line environment which should be pretty much all you need. It's > much less work than writing a custom program using the library calls. It > also makes modifying the model much easier. > > If you need to pull the data out of something messy send me a sample. awk is > really good for tasks such as merging data from several sources or parsing > complex formats. > > Have Fun! > Reg > > --- On Mon, 1/14/13, Alessandro Saccoia <[email protected]> wrote: > >> From: Alessandro Saccoia <[email protected]> >> Subject: Re: [Help-glpk] Problem with absolute value >> To: "Jeffrey Kantor" <[email protected]> >> Cc: "[email protected]" <[email protected]> >> Date: Monday, January 14, 2013, 6:17 AM >> Hi Jeff, >> that works wonders! Now I would just like to find a way to >> use the library instead of the executable, and insert all >> this information programmatically. In the glpk docs it seems >> that it's up to me to introduce all the variables and create >> the A matrix, but from another answer I got in pvt it looks >> like I can use this syntax and have the library do the >> necessary calculations. >> If I can't avoid reading the model from file, I would at >> least like to be able to provide the data at runtime. Thanks >> for your time! >> Alessandro >> >> On Jan 14, 2013, at 1:04 PM, Jeffrey Kantor <[email protected]> >> wrote: >> >>> Hi Alessandro, >>> >>> I don't exactly the geometry, but here's a MathProg >> model for your problem. If you want to try this out, cut and >> paste it into the web page at http://www3.nd.edu/~jeff/mathprog/mathprog.html >>> >>> Jeff >>> >>> >>> set N := 0..3; >>> param q{N}; >>> param r{N}; >>> >>> param a := 0.95; >>> param b := 1.05; >>> >>> var z{N} >= 0; >>> var s{N}; >>> >>> s.t. c1 {n in 0..3}: z[n] >= r[n] - s[n]; >>> s.t. c2 {n in 0..3}: z[n] >= s[n] - r[n]; >>> s.t. c3 {n in 0..2}: s[n+1] - s[n] >= >> a*(q[n+1]-q[n]); >>> s.t. c4 {n in 0..2}: s[n+1] - s[n] <= >> b*(q[n+1]-q[n]); >>> >>> minimize obj: sum{n in N} z[n]; >>> solve; >>> >>> data; >>> >>> param q := >>> 0 3 >>> 1 5 >>> 2 8 >>> 3 12 ; >>> >>> param r := >>> 0 2 >>> 1 5 >>> 2 7 >>> 3 11 ; >>> >>> end; > > > _______________________________________________ > Help-glpk mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/help-glpk _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
