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.
(See help plotregion for more documentation)
Per Bergström (2021). Plot 2D/3D region (https://www.mathworks.com/matlabcentral/fileexchange/9261-plot-2d-3d-region), MATLAB Central File Exchange. Retrieved .
Documentation could be better. Otherwise pretty useful. I have a question, though: Is there a way to rotate and translate objects defined as Ax >= b before plotting them?
Thanks for this. Is it not possible to place a point somewhere in the region? I am able to place points only at the extreme points of the region.
Thanks for this. it solves my problem perfectly!!
I wanted to draw simplex (2D and 3D), and it was bugy! the shape was completely wrong.
Amazing! So useful! Only minor point: Why set up up the region such that Ax>=b, when the standard MATLAB form for linear programming is Ax<=b
I need to plot the following region. Is there any way to plot it with this package?
a=0: 0.1 :1;
b=0: 0.1 :1;
y+x <= k(a,b);
where f, g, and k are nonlinear functions.
Excellent package - works like a charm and gets you experimenting in a second!
Is there anybody could tell me what the meaning of
answer to song:
ax<=b is euivalent to -ax>=-b
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
Good stuff! Thanks.
This is amazing. So easy to visualize complex regions! I love it.
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.
I like it a lot. As a minor point, though, it would be good if you could return a plot handle as an output argument.
Very good file. I love it. Thanks for sharing
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.
very good! just what i need for my thesis. Thanks!
Juan Carlos: You can close your polyhedron by adding goods upper and lower bounds.
I was looking for something similar, great!
Only one question, how can one do to appropiately define the planes to plot general closed regions?
I think it is very useful.
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.
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?
Just what I needed. Thanks.
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.
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