I need help randomizing a triangle

I have written a code that is suppose to randomize the triangle as well as the markers/colors/edgecolors but I cant get the triangle itself to randomize. The markers and colors randomize but the triangle only changes when i run the code. I dont know how to fix this. Below is what I have:

figure;

hold on;

xlim([0,1]);

ylim([0,1]);

point_A = rand(2,1);

point_B = rand(2,1);

point_C = rand(2,1);

run('TrianglePlot.m');

for x = 1:10

point_A = rand(2,1);

point_B = rand(2,1);

point_C = rand(2,1);

marker_types = 'o+*.x';

random_index = randi(5);

random_marker = marker_types(random_index);

markerSize_types = 50:100;

random_index = randi(5);

random_markerSize = markerSize_types(random_index);

markerEdgeColor_types = 'brgym';

random_index = randi(5);

random_markerEdgeColor = markerEdgeColor_types(random_index);

markerFaceColor_types = 'myrgb';

random_index = randi(5);

random_markerFaceColor = markerFaceColor_types(random_index);

triangle_handle.Marker= random_marker;

triangle_handle.MarkerSize = random_markerSize;

triangle_handle.MarkerEdgeColor = random_markerEdgeColor;

triangle_handle.MarkerFaceColor = random_markerFaceColor;

pause(1)

end

Answer 1

[Voss]

It is not enough to generate a new random point_A, point_B, and point_C on each iteration. You need to make those points take effect, so update the existing triangle's XData and YData based on the new point_A, point_B, and point_C:

figure;

hold on;

xlim([0,1]);
ylim([0,1]);

point_A = rand(2,1); 
point_B = rand(2,1); 
point_C = rand(2,1);

% run('TrianglePlot.m'); % no need to "run", just call the script
TrianglePlot

% the sets of markers, sizes, etc., don't change throughout the 10
% iterations, so they can be defined before the loop:
marker_types = 'o+*.x';
markerSize_types = 50:100;
markerEdgeColor_types = 'brgym';
markerFaceColor_types = 'myrgb';

for x = 1:10
    
    point_A = rand(2,1); 
    point_B = rand(2,1); 
    point_C = rand(2,1);
    
    random_index = randi(5);
    random_marker = marker_types(random_index);
    
    random_index = randi(5);
    random_markerSize = markerSize_types(random_index);
    
    random_index = randi(5);
    random_markerEdgeColor = markerEdgeColor_types(random_index);
    
    random_index = randi(5);
    random_markerFaceColor = markerFaceColor_types(random_index); 
    
    % update the XData and YData to have a "new" triangle:
    triangle_handle.XData = [point_A(1), point_B(1), point_C(1), point_A(1)];
    triangle_handle.YData = [point_A(2), point_B(2), point_C(2), point_A(2)];
    
    triangle_handle.Marker= random_marker;
    triangle_handle.MarkerSize = random_markerSize;
    triangle_handle.MarkerEdgeColor = random_markerEdgeColor;
    triangle_handle.MarkerFaceColor = random_markerFaceColor;
    
    pause(1)
    
end

Answer 2

[Vilém Frynta]

try command rng

https://www.mathworks.com/help/matlab/ref/rng.html

for example

rng("shuffle")

[Amanda]

This changes the markers but no the actual triangle points

[Vilém Frynta]

I do not know what is inside of “TrianglePlot.m”. You might need to use rng there if you use randomizing inside.

[Amanda]

triangleplot.m contains this

triangle_handle = plot([point_A(1), point_B(1), point_C(1), point_A(1)], [point_A(2),point_B(2), point_C(2), point_A(2)]);