Is there a way to get the Centroidal Momentum Matrix in Robotics Toolbox?

Question

Yigit Yakupoglu 2018-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/418064-is-there-a-way-to-get-the-centroidal-momentum-matrix-in-robotics-toolbox

评论： Marijn Peters 2020-5-7

In Robotics toolbox centerOfMass function returns center of mass of the robot and center of mass Jacobian of it. When I look inside the function I have realized that centroidal momentum matrix (written as cmm) is also being calculated but not returned, and I want to get that matrix. I cannot overwrite the file to change the outputs, and cannot write a wrapper due to class property being private. The error:

'No public property 'TreeInternal' for class 'RigidBodyTree'

Is there a way to get the Centroidal Momentum Matrix in Robotics Toolbox somehow? Thanks

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Answer 1

Amal George M 2018-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/418064-is-there-a-way-to-get-the-centroidal-momentum-matrix-in-robotics-toolbox#answer_336244

在 MATLAB Online 中打开

Hi Yigit,

In order to access this variable, you can edit the 'RigidBodyTree.m' file outside of MATLAB. At the location "<Matlabroot>\toolbox\robotics\robotmanip\+robotics" (Write permission required). You can add 'cmm' in the list of output variables to the function 'centerOfMass()'. The modified line will be:

function [com, comJac, cmm] = centerOfMass(obj, varargin)

Restart MATLAB for changes to take effect.

Full disclosure: If there is a dependency associated with this function it might result in an error in future. Also, there is no guarantee that the file will be accessible in later releases.