plot a sceleton in matlab

To plot a skeleton in MATLAB, you can follow these steps:

1. Define the joints of the skeleton as 3D points.
2. Define the connections between joints as a set of pairs of joint indices.
3. Use the plot3 function to plot the joints as points in 3D space.
4. Use the plot3 function again to plot the connections between joints as lines.

Here is an example MATLAB code that shows how to plot a simple skeleton consisting of three joints:

main.m
% Define the joints of the skeleton
joints = [0 0 0; 1 0 0; 0 1 0];

% Define the connections between joints
connections = [1 2; 2 3];

% Plot the joints as points
plot3(joints(:,1), joints(:,2), joints(:,3), 'o', 'MarkerSize', 10);

% Plot the connections between joints as lines
line(joints(connections(:,1),1), joints(connections(:,1),2), joints(connections(:,1),3), 'LineWidth', 2);
line(joints(connections(:,2),1), joints(connections(:,2),2), joints(connections(:,2),3), 'LineWidth', 2);
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13 lines

This will produce a 3D plot of the skeleton where the joints are shown as red dots and the connections between joints are shown as blue lines.

Note that in this example, the skeleton is defined in local coordinates (i.e. with respect to a reference frame centered at the first joint). If you want to plot a skeleton in global coordinates (i.e. with respect to a fixed reference frame), you need to apply a transformation to the joint positions before plotting.