I have an error but I dont know where it is referring to "Index exceeds the number of array elements"

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Rachel Ong
Rachel Ong 2022-1-3
评论： Rachel Ong 2022-1-4
This is my code for the intepreted MATLAB function on simulink
function [XDOT] = RCAM_model(X,U)
% ---------- State and control vectors ----------
x(1) = X(1); %u
x(2) = X(2); %alpha
x(3) = X(3); %q
x(4) = X(4); %theta
x(5) = X(5); %mass
x(6) = X(6); %vertical
x(7) = X(7); %horizontal
u1 = U(1); %eledefl
u2 = U(2); %thrustvec
u3 = U(3); %power
% ---------- Constants ----------
b = 10.2;
c = 1.74;
S = 17.1;
initial_mass = 1248.5;
Ix = 1421;
Iy = 4067.5;
Iz = 4786;
Ixz = 200;
g = 9.81;
rho = 1.225;
speedsound = 340;
% ---------- Control limits ----------
u1min = 0;
u1max = 25*pi/180;
u2min = 0;
u2max = 90*pi/180;
u3min = 1;
u3max = 4;
if(u1>u1max)
u1 = u1max;
else if (u<u1min)
u1 =u1min;
end
if(u2>u2max)
u2 = u2max;
else if (u<u2min)
u2 =u2min;
end
if(u3>u3max)
u3 = u3max;
else if (u<u3min)
u3 =u3min;
end
% ---------- Aerodynamic force coefficients ----------
CL = 6.44*x(2) + 3.8*c*x(3)/(2*x(1)) + 0.355*u(1); % Lift
L = 0.5*rho*speed^2 * CL;
CD = 0.03 + 0.05*CL^2; % Drag
D = 0.5*rho*speed^2 * CD;
Cm = 0.05 - 0.683*x(2) - 9.96*c*x(3)/(2*x(1)) - 0.923*u(1); % pitching moment
m = 0.5*rho*speed^2*S*c*Cm;
% ---------- Engine force ----------
thrust = u(3) * ( (7+speed/speedsound)*200/3 + x(6)*(2*speed/speedsound -11) )
% ---------- XDOT ----------
XDOT = [(thrust * cos(x(2)+x(2)) - D)/ x(5) - g*sin(x(4)-x(2));
q - (thrust*sin(x(2)+u(2)) + L) / x(5)* x(1) + g/x(1)*cos(x(4) - x(2));
m/Iy;
x(3);
-200/60/60/1000 * thrust;
x(1)*sin(x(4)-x(2));
x(1)*cos(x(4)-x(2))]
Below is my initilaizing constants script and to run the simulink simulation
% Initialize constatns for the rcam simulation
clear clc
close all
%% Define constants
x0 = [63.292; 0.043891; 0; 0.043891; 1248.5; 0; 0]; % u, alpha, q, theta, mass, vertical, horizontal
u = [0.021692; 0; 1]; % eledefl, thrustvec, power
TF = 60;
%% Run the model
sim('RCAMSimulation.slx')
I cant run the simulation and I got the error:
  • Error using InitializeConstants (line 15)
  • Error due to multiple causes.
  • Caused by:
  • Error using InitializeConstants (line 15)
  • Index exceeds the number of array elements (4).
  • Error using InitializeConstants (line 15)
  • Error in 'RCAMSimulation/Interpreted MATLAB Function' while evaluating expression.
Thank you for your help!
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Walter Roberson
Walter Roberson 2022-1-3
If you want u(1) to refer to u = [0.021692; 0; 1]; % eledefl, thrustvec, power then I suspect you might need to use a global memory store and a "global" statement in the MATLAB code. https://www.mathworks.com/help/simulink/ug/using-global-data-with-the-matlab-function-block.html
Alternately, I think you just might be able to use the workspace variable in the definition for the value of a Constant block, which you would then connect as an input to the MATLAB Function Block.

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