Re: solving set of inequalities

[Petr Korviny]

As I mentioned above, I need to find out solution of set of linear inequalities
(to get values of variables x1,x2,x3,...) or to get an information of
nonexistence any such solution.

At this picture:
http://suzelly.opf.slu.cz/~korviny/zzz/octave/excel_solver.png
you can see utilization of Excel's Solver add-in I used to get solution of
viewed set. "alpha" variable is always set to a number <0;1>, so set of
inequalities is linear.

Finding a solution for this set of linear inequalities is only one step in the
process. I'd like to write it all as a script in Octave.

All tips and suggestions are welcome.  Thanks

Petr


On 25.1.2010 07:13, Jaroslav Hajek wrote:
> On Sat, Jan 23, 2010 at 10:34 PM, Petr Korviny<address@hidden>  wrote:
> > Thanks a lot for quick answers.
> >
> > "jwe" you are right, that's exactly my problem.
> > I have got no objective function to minimize or maximize and all functions I
> > have found
> > in Octave require objective coefficients, the "glpk" too.
> >
> > I'll try mentioned "octave-sp", I'm running Ubuntu, and this package is
> > still in repositories for octave3.0 version.
> >
> > Thanks again to all.
> >
> > Petr
>
> Uh, sorry, I should read more carefully. Apparently each inequality
> bounds the solution to a half-space (separated by a hyperplane) so the
> solution space is the intersection of these half-spaces. In what form
> you want to get the solution?