MATLAB: Selecting a triangle in an array of delaunay points

Question

The code explains it all.

Try to run it, it might give you a good result, but that would be random.

This code is supposed to display a point, and color the nearest triangle green. It does not do this, and gives "nan" errors on seemingly random iterations of the loop.

I would appreciate some help 🙂

clc;
clear all;
close all;
P = [ 2.5    8.0
      6.5    8.0
      2.5    5.0
      6.5    5.0
      1.0    6.5
      8.0    6.5];
  dt=delaunayTriangulation(P);
  triplot(dt);
  hold on
  %%example functions 
  dt.Points
  dt.ConnectivityList
  %abs vals x
  a=min(P(:,1))
  b=max(P(:,1))
  %abs vals y
  c=min(P(:,2))
  d=max(P(:,2))
    for n=1:5
        random_x=a + (b-a).*rand(1);
        random_y=c + (d-c).*rand(1);
         triangleId=pointLocation(dt, random_x,random_y) %select the triangle ID of the triangle closest to the point generated by the random generator
         scatter(random_x,random_y)                       %display the points
         %%now... the part that does not work
         %%selecting the right triangle and turning it a different color
         tri = dt(triangleId, [1:end 1]);
         patch(P(tri,1), P(tri,2), 'r', 'LineWidth',1, 'FaceColor','g')
    end

Answer 1

Answered, thanks!