Legend in plot of data points

Hello everyone

I have some nodes that plot them as a 3D Plot as below:

p1=[6 3 0]';
 p2=[3 5 0]';
 p3=[1 7 0]';
 p4=[1 -1 0]';
 x=[];
 y=[];
 z=[];
 x(1)=p1(1), y(1)=p1(2), z(1)=p1(3);

x = 6

y = 3

 x(2)=p2(1), y(2)=p2(2), z(2)=p2(3);

x = 1×2

6 3

y = 1×2

3 5

 x(3)=p3(1), y(3)=p3(2), z(3)=p3(3);

x = 1×3

6 3 1

y = 1×3

3 5 7

 x(4)=p4(1), y(4)=p4(2), z(4)=p4(3);

x = 1×4

6 3 1 1

y = 1×4

3 5 7 -1

figure
p1=plot3(x,y,z,'rd','MarkerFaceColor','b')

p1 = 
  Line with properties:

              Color: [1 0 0]
          LineStyle: 'none'
          LineWidth: 0.5000
             Marker: 'diamond'
         MarkerSize: 6
    MarkerFaceColor: [0 0 1]
              XData: [6 3 1 1]
              YData: [3 5 7 -1]
              ZData: [0 0 0 0]

  Show all properties

grid on
xlim([-5 10])
ylim([-5 10])
zlim([-5 10])
xlabel('X Axis'), ylabel('Y Axis'), zlabel('Z Axis');

Now, I want to shape p1 as star (*) (I think it is MarkerShape but I don't know how do it for one point)

and use legend only for one point (p1) because p1 is different from others.

Thank you

Answer 1

[albara]

p1 as a star, you can use the 'Marker' property with the value '*'. To create a legend only for the first point, you can provide a label to the 'DisplayName' property. Here's the updated code:

p1 = [6 3 0]';
p2 = [3 5 0]';
p3 = [1 7 0]';
p4 = [1 -1 0]';
x = [];
y = [];
z = [];
x(1) = p1(1), y(1) = p1(2), z(1) = p1(3);

x = 6

y = 3

x(2) = p2(1), y(2) = p2(2), z(2) = p2(3);

x = 1×2

6 3

y = 1×2

3 5

x(3) = p3(1), y(3) = p3(2), z(3) = p3(3);

x = 1×3

6 3 1

y = 1×3

3 5 7

x(4) = p4(1), y(4) = p4(2), z(4) = p4(3);

x = 1×4

6 3 1 1

y = 1×4

3 5 7 -1

figure
% Plot the first point with a star marker
p1 = plot3(x(1), y(1), z(1), 'r*', 'MarkerFaceColor', 'b', 'DisplayName', 'p1');
hold on
% Plot the remaining points with a diamond marker
p_rest = plot3(x(2:end), y(2:end), z(2:end), 'rd', 'MarkerFaceColor', 'b');

grid on
xlim([-5 10])
ylim([-5 10])
zlim([-5 10])
xlabel('X Axis'), ylabel('Y Axis'), zlabel('Z Axis');
% Create a legend only for the first point
legend(p1);

This code will plot the first point (p1) with a star marker and the other points with a diamond marker. The legend will only display the label for p1.

Important: There may be some mistakes in this answer Experts can tell if there are any mistakes and you might find better answer

Give me your feedback

Thanks