The program plots convex closed regions in 2D/3D. The region is a subset of R2 or R3 such that Ax>=b and lb<=x<=ub. It is also possible to plot points in the same plot.

It is very helpful to me. As a beginner for Matlab, I have a question which is how could I modify the program to Ax<=b. Can you help me on it?
Thanks in advance

This is amazing! It was very useful for my purpose (I am developing a GUI to show the steps that simplex takes to solve an optimization problem). But I have a question: is it possible to draw different faces of the polyhedron with different colors? I like to have some nice and colorful figure for the feasible region of the problem which is a polyhedron.

Thanks for a nice package - it saved me quite some time! A hint to users: You get the error "Vector must have 4, 6, or 8 elements." if you specify an unfeasible set, i.e. if your A and b are such that no x fulfill Ax >= b. In my case, it was because I happened to define the normal vectors so they point out instead of in, i.e., the sign of A was reversed.

13 Oct 2008

Rodrigo Lopez

very good! just what i need for my thesis. Thanks!

Juan Carlos: You can close your polyhedron by adding goods upper and lower bounds.

03 Jul 2008

Thierry Dalon

Good contribution!

18 Dec 2007

Juan Carlos Trillo

I was looking for something similar, great!
Only one question, how can one do to appropiately define the planes to plot general closed regions?

05 Dec 2007

Jianing Di

I think it is very useful.

26 Nov 2007

Steven Randolph

22 Oct 2007

PA L

interesting

16 Jun 2007

E. Hearn

I am sure this works well, but it needs clearer documentation. I simply cannot understand the format.
"The region(s) x is a subset of R2/R3 s.t. A*x>=b and lb<=x<=ub" is rather cryptic.

30 May 2007

Golnaz Habibi

12 Feb 2007

mc k

07 Feb 2007

a a

26 Sep 2006

Amir Ali Ahmadi

After hours of playing around with different m-files, trying to figure out how to fill the region b/w the intersection of some planes in R^3, I found this m-file which took care of the job in less than a minute.

Matlab has a built-in function ?area? for 2-D but nothing for 3-D (to my understanding).

I used plotregion.m to visualize a subset of R^3 where all the vectors have norm-1 less than say 3. (i.e. abs(x)+abs(y)+abs(z)<=3). This is easily done using this m-file by inputting an 8x3 constraint matrix A.

Thanks a lot & great work?

-AAA

15 Feb 2006

Peter Larsen

Just what I needed. Thanks.

06 Dec 2005

John D'Errico

Splendid. A very nice utility that I'll happily use. I'd have
liked more documentation in the help, but I tend to go
overboard there myself, so my standards may be deemed
excessive by sane, rational beings. The examples were
enough to figure it out.

Updates

07 Dec 2005

Uncomplete description

17 Jan 2006

John D'Errico had an idea how to do the program more user-friendly. That was by adding simpe bounds, lb & ub, to the arguments. So I did.