Matlab function inside Simulink gives parse error

I have included the Matlab Function block in a Simulink diagram to call a matlab function, http://www.mathworks.nl/help/simulink/slref/matlabfunction.html.

Now when I want to simulate the Simulink diagram I get the error:

 Errors occurred during parsing of MATLAB function 'MATLAB Function'(#384)

I however do not find any errors in my matlab function script:

 function out = Sigma(xyz,x1,u)
 x = xyz(1);
 y = xyz(2);
 z = xyz(3);

 out = [-x^3 + 3*x + 2 + 5*y - z + u; ...
        -0.8 - x^2 - 2*x - y;         ...
        0.005*(4*(x1 + 1.77) - z)];
 end

The input xyz is a mux-ed signal with length 3, x1 and u are scalar values.

So what is going wrong? Can anyone look threw my files?

https://dl.dropboxusercontent.com/u/20782274/matlab.zip

It contains three files. - main.m, the main file in some variables are declared and which runs the simulink model - Sigma.m, a copy of the matlab function - HindmarshRose.mdl, the simulink model.

[Kaustubha Govind]

Please scroll down through the list of errors in the popup window and see if you can find more details about the error, especially one pointing to a line number in your code.

Answer 1

[Wouter]

It turns out you have to initialize the output before calling any Matlab code since otherwise Matlab does not know the length of the output.

function out = Sigma(xyz,x1,u)
 out = zeros(3,1);
 x = xyz(1);
 y = xyz(2);
 z = xyz(3);
 out = [-x^3 + 3*x + 2 + 5*y - z + u; ...
        -0.8 - x^2 - 2*x - y;         ...
        0.005*(4*(x1 + 1.77) - z)];
end

Answer 2

[Dragoș Vasile]

Hello,

I have the same problem and I have already tried to put the output size but the error still appears.

The code is in a Matlab function in Simulink.

Here is my code:

function [ Ts, Tq ] = Ts_function( PWM ) %THRUST_AND_TORQUE Summary of this function goes here % Detailed explanation goes here

P = [1000 1200 1500 1600 1650 1700 1750 1800 1850 1900 1950 2000];

Fq= [0 50 75 84 91 94 100 109 113 119 121 125];

RPM = Fq * 60;

Ts1 = 8.9e-7*RPM.^2.3314;

Tq1 = 1.0798e-005*Ts1;

Thrust = interp1(P,Ts1,PWM,'spline'); Torque = interp1(P,Tq1,PWM,'spline');

end

Answer 3

[Christopher Magana]

I have the same problem and all I'm trying to do is use Bitconcat in simulink...It is not even my function and its throwing an error for it.