How to convert polynomial trajectory block out to a 4×4 homogeneous transformation matrix
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I created 7 waypoints using inverse kinematics designer app and exported the configuration into a matrix (7×6 matrix) containg xyz position and respective euler angles. From this matrix i input only the xyz position data(3×7 matrix) as waypoints to a polynomial trajectory block with time. But when i run the simulink an error is showing up, saying that polynomial trajectory output should be 4x4 homogeneous matrix inorder to connect to the inverse kinematics block input (pose). How could I resolve this issue
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Zinea
2025-3-30
The documentation of "Inverse Kinematics" block specifies that it expects a 4x4 homogeneous transform as input, which is the cause of the error. You can refer the documentation link given below:
To resolve the error as stated in the question, you need to follow these steps:
1) Create a function that converts XYZ positions into 4x4 homogeneous matrices.
function H = xyz2homogeneous(xyz)
H = eye(4); % Create 4x4 identity matrix
H(1:3,4) = xyz(:); % Set translation component
end
2) Add a "MATLAB Function" block after your "Polynomial Trajectory" block with the following code inside it:
function H = fcn(xyz)
H = eye(4);
H(1:3,4) = xyz;
H(1:3,1:3) = eye(3); % Identity rotation matrix
end
In this way you can get the correct 4x4 matrix format for the "Inverse Kinematics" block, while using the existing XYZ trajectory generation.
Best!
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