derivatives of state variables

5 次查看（过去 30 天）
RoBoTBoY
RoBoTBoY 2020-4-26
评论： Ameer Hamza 2020-4-26
Dear,
I want to find the derivative of this
α*x_1+b*x_2+q*abs(x_2)*x_2+r*x_3. Where x_1,x_2,x_3 are state variables from aircraft
How can I do in Matlab?

请先登录，再回答此问题。

回答（1 个）

Ameer Hamza
Ameer Hamza 2020-4-26
Use symbolic toolbox. First define the equation
syms alpha b q r x_1 x_2 x_3
eq = alpha*x_1 + b*x_2 + q*abs(x_2)*x_2 + r*x_3;
and take derivative w.r.t to different variables
>> diff(eq, x_1) % derivative w.r.t x_1
ans =
alpha
>> diff(eq, x_2) % derivative w.r.t x_2
ans =
b + q*abs(x_2) + q*x_2*sign(x_2)
>> diff(eq, x_3) % derivative w.r.t x_3
ans =
r
  4 个评论
显示 2更早的评论
RoBoTBoY
RoBoTBoY 2020-4-26
I think that's what I wanted. thank you very much

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Calculus 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by