How can I use a function handle in Simulink "matlab function" block?

9 次查看（过去 30 天）
Muhammad Zeeshan Babar
编辑： Vignesh Ramakrishnan 2023-6-12
Hello,
I am trying to simulate this first order function
*function [f,h] = Model_First_order(u,deltat)
f=@(x)[x(1)+deltat*(-x(2)*x(1)+u(1)); x(2)]; h=@(x)x(1);*
using the function handle in Simulink Matlab function block. But as I try to simulate it, it gives me an error that
Anonymous functions are not supported for code generation. Function 'Model_first_order' (#23.313.314), line 21, column 3: "@" Launch diagnostic report. Component: MATLAB Function | Category: Coder error
Please help me to solve this problem.

请先登录，再回答此问题。

回答（1 个）

Sebastian Castro
Sebastian Castro 2015-8-11
编辑：Sebastian Castro 2015-8-11
If you won't be generating code from your Simulink model (i.e., you just want a desktop simulation), you could do a few things:
  1. Place your entire code in a regular MATLAB function .m file, and call it from Simulink using an Interpreted MATLAB Function block instead.
  2. Place just the unsupported piece (the generation of the function handle) in a separate function and call it as interpreted using coder.extrinsic.
... or, my favorite approach:
3. Given that you seem to be modeling some kind of first-order set of equations, it would probably be MUCH easier (and numerically accurate) to implement the equations in Simulink with Integrator blocks!
http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/
- Sebastian
  2 个评论
Muhammad Zeeshan Babar
Muhammad Zeeshan Babar 2015-8-11
Thankyou Sebastian. But the theme of writing the model in this form (as I mentioned in my question) is that I am using these function handle in other MATLAB function as well. e.g
r=0.1; s=[0,1]; z = h(s) + r*randn; s=f(s)+r*randn;
you can see that I am evaluating h and f here on some values of s. It is running in a loop where I called the estimation algorithm. That's why I need to use this interpretation. I am trying to make multiple MATLAB function blocks in order to solve a parameter estimation problem. This is only a portion of my problem where I just need my model to simulate and give me f and h as output. It is working in .m file but not in Simulink.
Vignesh Ramakrishnan
Vignesh Ramakrishnan 2023-6-12
编辑：Vignesh Ramakrishnan 2023-6-12
@Sebastian Castro, quick follow-up on this question: Say I have solved a first order ODE in Simulink and called the simulink file say ode.slx, using:
y=sim("ode.slx");
I wish to make a function handle for this call, and hopefully make a phase portrait with a quiver plot and contour lines. Is there some way to pull that off?

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Event Functions 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