MATLAB: How to find the time and partial derivative

partial derivativetime derivative

Hello!

I have this:

How to represent the above in matlab in order to find the partial derivative w.r.t. q1_dot, that is the below

And after that i want to find the time derivative from the above.

Thanks in advance

Best Answer

You don't really need the power of MATLAB here; elementary calculus will do:

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MATLAB: Simplifiy function incorrect result

You just need to tell simplify to keep simplifying:

DetJa = simplify(detJa, 'Steps',500)

producing:

DetJa = 
l3*l4*sin(q3)*(l4*cos(q2 + q3) + l3*cos(q2))

MATLAB: What is wrong with the differentiation of function of phi(t)

I think what you want is to substitute a variable for diff(fi,t), differenitate wrt to that variable, and substitute back.

>> syms fiprime
>> L(t) = t^2 + t^3*diff(fi(t),t)^2;  % example
>> D11 = subs(diff(subs(L(t),diff(fi(t),t),fiprime),fiprime),fiprime,diff(fi(t),t))
D11 =
 
2*t^3*diff(fi(t), t)

Best Answer

Related Solutions

MATLAB: Simplifiy function incorrect result

MATLAB: What is wrong with the differentiation of function of phi(t)

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