Derivate an expression with time

2 次查看（过去 30 天）
Anis Frej
Anis Frej 2020-4-18
评论： Anis Frej 2020-4-18
Good Morning,
My problem is I have an equation depends on theta and I don't have an expression of theta (which is the variable in the equation), and theta depends on t and i like derivate my equation with t.
For example my equation is as follows : f (t) = a * cos (theta)
Where theta = theta (t) And I would like to have a result in this style : f '(t) = - a * (theta)' * sin(theta)
Thank you.

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2020-4-18
syms a theta(t) theta_prime f_prime
f(t) = a * cos(theta);
dtheta = diff(theta,t);
df = diff(f,t);
f_prime == subs(df, dtheta, theta_prime)

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by