Dear MathWorks-Community,

I recived the following error message:

Error using symengine
First argument must not contain functionals.
Error in mupadengine/evalin_internal
Error in mupadengine/fevalHelper
Error in mupadengine/feval_internal
Error in sym/diff (line 107)
R = feval_internal(symengine, ‘symobj::diff’, S, x, n);

When I wanted to run my code it appeard for line 10 where I am calculating diffL_over_theta1dot. Can someone please explain me why it worked for diffL_over_alpha1 in line 4 but not for line 10?
L is a symfun.

Can anyone help me with resolving this issue?
Thanks a lot in advance!
syms tau_1
syms theta_1(t) alpha_1(t)

diffL_over_alpha1=diff(L,alpha_1);
alpha_1dot=diff(alpha_1,t);

tau_1==diff(diffL_over_alpha1dot,t)-diff(L,alpha_1dot);

theta_1_dot=diff(theta_1,t);
diffL_over_theta1dot=diff(L,theta_1_dot)

0==diff(diffL_over_theta1dot,t)-diff(L,theta_1);Dear MathWorks-Community,

I recived the following error message:

Error using symengine
First argument must not contain functionals.
Error in mupadengine/evalin_internal
Error in mupadengine/fevalHelper
Error in mupadengine/feval_internal
Error in sym/diff (line 107)
R = feval_internal(symengine, ‘symobj::diff’, S, x, n);

When I wanted to run my code it appeard for line 10 where I am calculating diffL_over_theta1dot. Can someone please explain me why it worked for diffL_over_alpha1 in line 4 but not for line 10?
L is a symfun.

Can anyone help me with resolving this issue?
Thanks a lot in advance!
syms tau_1
syms theta_1(t) alpha_1(t)

diffL_over_alpha1=diff(L,alpha_1);
alpha_1dot=diff(alpha_1,t);

tau_1==diff(diffL_over_alpha1dot,t)-diff(L,alpha_1dot);

theta_1_dot=diff(theta_1,t);
diffL_over_theta1dot=diff(L,theta_1_dot)

0==diff(diffL_over_theta1dot,t)-diff(L,theta_1); Dear MathWorks-Community,

I recived the following error message:

Error using symengine
First argument must not contain functionals.
Error in mupadengine/evalin_internal
Error in mupadengine/fevalHelper
Error in mupadengine/feval_internal
Error in sym/diff (line 107)
R = feval_internal(symengine, ‘symobj::diff’, S, x, n);

When I wanted to run my code it appeard for line 10 where I am calculating diffL_over_theta1dot. Can someone please explain me why it worked for diffL_over_alpha1 in line 4 but not for line 10?
L is a symfun.

Can anyone help me with resolving this issue?
Thanks a lot in advance!
syms tau_1
syms theta_1(t) alpha_1(t)

diffL_over_alpha1=diff(L,alpha_1);
alpha_1dot=diff(alpha_1,t);

tau_1==diff(diffL_over_alpha1dot,t)-diff(L,alpha_1dot);

theta_1_dot=diff(theta_1,t);
diffL_over_theta1dot=diff(L,theta_1_dot)

0==diff(diffL_over_theta1dot,t)-diff(L,theta_1); symbolic MATLAB Answers — New Questions

​