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Syntax error in simulink

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Quamar Niyaz
Quamar Niyaz on 18 Jul 2016
Commented: Mark McBroom on 14 Nov 2020
Getting syntax error in Simulink for this expression
m*(u(1)-l*u(3)*u(3)*sin(u(2))+l*u(4)*cos(u(2)))
The equation seems correct. Can anyone explain it?
  6 Comments
Shoanaliy Arul
Shoanaliy Arul on 12 Nov 2020
I am also getting the simular error.
Mine says:
The expression: m*(u(1) - l*u(3)*u(3)*sin(u(2)) + l*u(4)*cos(u(2))) in 'Pend_Model/Subsystem/N' has a syntax error

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Answers (1)

Mark McBroom
Mark McBroom on 14 Nov 2020
The following variables need to be defined in the MATLAB workspace:
I, g, b, m, l, M
thetadot is missing a paren. It hsould be:
1/I*(-u(1)*cos(u(3)) - u(2)*sin(u(3)))
  1 Comment
Mark McBroom
Mark McBroom on 14 Nov 2020
Note. I debugged this by cutting and pasting each of the equations into the MATLAB workspace. This gives more detailed info on undefined variables and syntax errors.

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