Wrong Legend Sign Marker

Hello, I would like to show the legend for a1 and (a3,a4) together.

But when I run it both legend entry are displayed with a black filled dot and not with the red one (the second).

How can I fix it?

figure(1)
for i = z
    hold on; grid on; grid minor; axis equal;
    set(gcf, 'Color', 'White');
    set(gca, 'Fontsize', 12);
    set(gca, 'ZDir','reverse')
    a1 = scatter3(x*100,y*100,i*100,15,'filled', 'k');
    a2 = plot3(X3D*100, Y3D*100, Z3D*100, 'k');
    a3 = scatter3(C2(:,1),C2(:,2),C2(:,3),'filled', 'r'); %No Flow
    a4 = scatter3(C22(:,1),C22(:,2),C22(:,3),'filled', 'r'); %No Flow
    view(3)
    xlabel('x [mm]')
    ylabel('y [mm]')
    zlabel('z [mm]')
    legend([a1, a3 a4], 'Fiducial Markers', 'IPR Markers')
    title('Fiducial Markers vs. IPR Tracked Markers')
    subtitle('Wing NO Flow - 6DOF Fit')
end

Answer 1

[Star Strider]

I am not able to run the code so I cannot test this, however one approach could be:

legend([a1(1), a3(1) a4(1)], 'Fiducial Markers', 'IPR Markers')

Experiment with that approach (or similar approaches).

(I will delete my Answer if it fails to solve the problem.)

.

[Fabio Taccaliti]

Hi, thanks a lot! It is working now :)

Why I should add (1) to the datasets?

[Star Strider]

As always, my pleasure!

Your code plots vectors of points, and the legend function will obediently assign consecutive points to each consecutive legend string entry. The (1) subscript tells legend to only use the first element in each vector to assign to a legend string entry.

.

[Fabio Taccaliti]

Ahh, clear!! Thanks a lot.

[Star Strider]

As always, my pleasure!