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Writing a MATLAB Script

This MATLAB code initializes parameters and initial conditions, runs the Simulink model simulation, retrieves the output data, and manages Simulink models.

clear;

% init parameters
[A, B, C, D] = uav1_data();

init = [0.1 0 0 0];
ref_signal = -0.1;

t_s = 0;
t_e = 1200;
dt = 0.1;

sim_out = sim('uav1_model.slx');

y = sim_out.get('yout');

u = y.getElement(1).Values.Data;
w = y.getElement(2).Values.Data;
q = y.getElement(3).Values.Data;
theta = y.getElement(4).Values.Data;
t = y.getElement(5).Values.Data;

bdclose('all');
open('uav1_model.slx');

What the Script Does

  1. Clear the workspace
clear;

Removes all variables from the MATLAB workspace to avoid conflicts with previous data.

  1. Initialize model parameters
[A, B, C, D] = uav1_data();

The uav1_data function returns the system matrices (A, B, C, D) describing the dynamics in state-space form.

  1. Initial conditions and simulation parameters
init = [0.1 0 0 0];
ref_signal = -0.1;

t_s = 0;
t_e = 1200;
dt = 0.1;
  • init — initial state vector.
  • ref_signal — target control signal.

  • t_s, t_e, dt — simulation start/end times and time step.

  • Run the simulation

sim_out = sim('uav1_model.slx');

Starts the simulation of the uav1_model.slx model. The result is stored in sim_out.

  1. Extract data
y = sim_out.get('yout');

u = y.getElement(1).Values.Data;
w = y.getElement(2).Values.Data;
q = y.getElement(3).Values.Data;
theta = y.getElement(4).Values.Data;
t = y.getElement(5).Values.Data;

Retrieves control inputs, velocities, pitch angle, and time values from the results.

  1. Close/open the model
bdclose('all');
open('uav1_model.slx');

Closes all open models and opens uav1_model.slx for inspection or editing.