Creating a Regular Delanuy Triangulation.

Hello, I would like to create a Delanuy Triangulation like below:

Only difference with my code is that the x and y intervals are different.

Here are the steps I have taken so far. I have set the limits to the triangulation:

minX = 2.58 * 1E5; 
maxX = 2.8 * 1E5;

minY = 1.82 * 1E5;
maxY = 1.93 * 1E5;

I have then calculated the distance between the limits:

 Xdiff = maxX - minX;

 Ydiff = maxY - minY;

Set the ratio between the two:

Ratio = Ydiff/Xdiff;

I have then prescribed the number of x points and then multiplied the number of y points by the previous ratio.

NumPointsX = 220;

NumPointsY = NumPointsX * Ratio;

I then calculate the intervals:

XSep = Xdiff/NumPointsX;

YSep = Ydiff/NumPointsY * Ratio;

using the interval and limits, I can then assign an even number of x and y points.

x = (minX:XSep:maxX)';

y = (minY:YSep:maxY)';

and then I use the Delanuy Triangulation.

    DT = delaunayTriangulation(x,y);

Upon doing so, I am unable to obtain a connectivity list and believe there is an error in my code. I don't know if anyone could help me with this issue so that I can create a regular Delanuy triangulation.

Many Thanks

Paul

Answer 1

[jonas]

The triangulation is not where your problem is. Before you triangulate, you need to have a grid, which you do not. Try plotting x against y and you can see that you a straight line. You probably want to use meshgrid for creating your grid.

[X,Y] = meshgrid(x,y);
DT = delaunayTriangulation(X(:),Y(:));

DT =

delaunayTriangulation with properties:

              Points: [48841×2 double]
    ConnectivityList: [96800×3 double]
         Constraints: []

You can then simply plot

triplot(DT)

[apex116]

yes that solved the problem. Thank you for your help, much appreciated.