Draw Lines between Points in MATLAB

S_David

Hi,

I have a matrix V, which is a 5-by-2 matrix, where each row represents a point in the xy-plain. How can I connect these points together in MATLAB, please?

Thanks in advance

jhae2.718

plot(V(:,1),V(:,2)) should do it, if I remember my matrix slicing.

S_David

Ya, I tried this, but it does not work. It connects just between three points. I need to connect between all points to form a closed graph, starting from a point and ending at the same point.

Thanks

jhae2.718

It only plots three points?

I think you should be able to get a connected graph by appending the start point onto the matrix (getting a 6x2) and then using plot.

S_David

Thank you very much. It is now working perfectly.

jhae2.718

Glad to hear it.

S_David

If I want to extend it to 3D, is it straightforward to do that?

jhae2.718

You should probably be able to do something similar with plot3() for lines in R³.

S_David

That indeed works, but this connects all the points together. Actually, in 3D I just want to connect the adjacent points only. How can I do that?

jhae2.718

I'm not sure what exactly you mean by this...

S_David

Neither do I. But basically, V is a matrix that contains the vertices of a polytope, and I want just to connect the adjacent vertices not all together. I am not sure how to know what are the adjacent vertices from V.

Thanks

jhae2.718

You may have to break the matrix up into matrices such that plot3 will produce the lines connected the way you want.

Another option is to look on the file exchange and see if there's anything you can use there. http://www.mathworks.com/matlabcentral/fileexchange/

S_David

Ok, I will. Thank you.

jhae2.718

I think there may be a file on the exchange that will do what you want, otherwise I'm afraid I don't know of a built in function that will do what you want on only one call.