Finding the derivative of a function with respect to the derivative of a variable
8 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I am trying to derive the expression that contains a dependent variable x with respect to the derivative of x, but although I defined dx as a variable I get the error message
Second argument must be a variable, a symfun or a list of variables and symfuns.
The output should be 2*diff(x,t,1).
syms x(t)
dx = diff(x,t,1);
L = dx^2
functionalDerivative(L,dx)
0 commentaires
Réponses (1)
Deepak Meena
le 20 Jan 2021
Hi Andrew ,
Now to get the desired Output you can do get something like this:
syms x(t) dx ad
dx = diff (x, t, 1);
L(ad) = subs(dx^2, dx, ad);
p = subs(diff(L, ad), ad, dx);
>>p
p(ad) =
2*diff(x(t), t)
Thanks
Deepak
0 commentaires
Voir également
Catégories
En savoir plus sur Symbolic Math Toolbox dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!