MATCONT: Load State Space A,B,C,D matrices for continuation analysis

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Junaid Ali
Junaid Ali 2024-8-27
回答： Sahas 2024-8-29
Hello All,
I am struggling to understand how I can load my matlab m file which is a function definition of my A,B,C,D matrices (defining the dynamics of my system) in MATCONT instead of typing each equation separately in MATCONT. Is there any way I can load this model in matcont directly?
Thanks
Junaid

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Sahas
Sahas 2024-8-29
Hi @Junaid Ali,
As per my understanding, you would like to import a MATLAB “.m” file which contains the function definition to the state-space variable matrices, in MATCONT.
Please follow the attached documentation of MATCONT. You can refer to the following sections for assistance with the required task:
  • Chapter 3 (Page 18 onwards) provides details and the syntax of defining the inputs and outputs to a “Continuer” using a “curve.m” file and other details on using files and functions in MATCONT.
  • Chapter 4 (Page 33 onwards) gives the structure to define an “odefile” which is an initialization step before doing continuation analysis.
  • Appendix A (Page 115) has a “Continuer” example and the code for “curve.m” file.
The documentation link for MATCONT: https://webspace.science.uu.nl/~kouzn101/NBA/ManualMatcontAug2019.pdf
You can also use MATLAB for solving Boundary Value Problems (BVPs) using continuation analysis. Refer to the following MathWorks documentation link below for more information:
I hope this is beneficial!

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Shubham
Shubham 2024-8-28
Hi Junaid,
MATCONT is a MATLAB software package for the numerical analysis of dynamical systems. If you have a MATLAB .m file that defines the dynamics of your system through functions for matrices ( A ), ( B ), ( C ), and ( D ), you can indeed use it in MATCONT, but it requires a few steps to integrate it properly.
Steps to Use Your MATLAB Function in MATCONT
  1. Ensure that your MATLAB function is defined correctly. It should accept state variables and parameters as inputs and return the matrices ( A ), ( B ), ( C ), and ( D ). For example:
function [A, B, C, D] = system_dynamics(x, p)
% x is the state vector
% p is the parameter vector
% Define your matrices here
A = [...]; % Define matrix A
B = [...]; % Define matrix B
C = [...]; % Define matrix C
D = [...]; % Define matrix D
end
2. MATCONT requires the system's equations to be in a specific format. You might need to create a new function that calls your existing function and formats the output as required by MATCONT.
3.Write a wrapper function that calls your original function and formats the output for MATCONT. This function should output the derivatives of the state variables. For example:
function dxdt = matcont_wrapper(t, x, p)
[A, B, C, D] = system_dynamics(x, p);
% Assuming a state-space representation: dx/dt = A*x + B*u
u = ...; % Define the input if necessary
dxdt = A*x + B*u; % Modify based on your system
end
4. In MATCONT, you can specify the wrapper function as the system function when setting up your continuation problem. This is usually done through the MATCONT GUI or by scripting.
5. Ensure that your parameters and initial conditions are set correctly in MATCONT. You may need to specify these in the MATCONT interface or script.
6. Once your system is set up in MATCONT with the wrapper function, you can proceed with continuation analysis as usual.

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