Define a Matrix 3x3 using matlab

I'm tryin to define a 3x3 matrix using matlab but I get an error: Undefined function or variable 'A'. Here's my code:

J := matrix([[-(l1+q2)*sind(q1)-l3*sind(q1+q2), cosd(q1), -l3*sind(q1+q3)], [(l1+q2)*cosd(q1)+l3*cos(q1+q3), sind(q1), l3*cosd(q1+q3)],[1,0,1]]);

Can someone please help with the syntax?

[Azzi Abdelmalek]

There is no any variable A in your expression, := is not a Matlab operator, use instead = operator

Answer 1

[Naga]

Hello Nemo,

It looks like there are a few syntax issues in your MATLAB code. As Azzi mentioned MATLAB does not use := for assignment; instead, it uses =. Additionally, the function to define matrices in MATLAB is simply using square brackets [] without the 'matrix' keyword. Here is

The corrected MATLAB code:

J = [-(l1 + q2) * sind(q1) - l3 * sind(q1 + q2), cosd(q1), -l3 * sind(q1 + q3); 
    (l1 + q2) * cosd(q1) + l3 * cosd(q1 + q3), sind(q1), l3 * cosd(q1 + q3); 
    1, 0, 1];