My program works on MATLAB, but doesn't work on simulink. The error message says that Ph1 is empty. But it shouldn't be and is not empty on MATLAB. Can someone help me ?

function [M1, M2] = test_sortie(x, y, T, A)

tabtheta = zeros(1,length(T));

for i = 1:length(T) %on crée le tableau avec tous les angles correspondants aux séparations entre les bandes

tabtheta(i) = (pi/2 - atan2(y, T(i,1)-x))*180/pi;

end

Ph1 = [];

Ph2 = [];

[~, Ph2] = find(tabtheta>-3.04 & tabtheta<6.84); %On trouve tous les angles que les capteurs voient

[~, Ph1] = find(tabtheta>-6.84 & tabtheta<3.04);

Ph1calibre = zeros(1,length(Ph1)+2);

Ph2calibre = zeros(1,length(Ph2)+2);

for i = 2:(length(Ph1)+1)

Ph1calibre(i) = round(((tabtheta(Ph1(i-1))+3.8/2)/0.005) + 1975/2 + 1); %On calibre les bons angles

end

for i = 2:(length(Ph2)+1)

Ph2calibre(i) = round(((tabtheta(Ph2(i-1))-3.8/2)/0.005) + 1975/2 + 1); %On calibre les bons angles

end

Ph1calibre(1) = 1;

Ph1calibre(end) = 1976;

Ph2calibre(1) = 1;

Ph2calibre(end) = 1976;

Ph1 = [Ph1, Ph1(end)+1];

Ph2 = [Ph2, Ph2(end)+1];

M1 = 0;

M2 = 0;

for i = 1:length(Ph1)

M1 = M1 + T(Ph1(i),2)*A(Ph1calibre(i+1), Ph1calibre(i)); %calcul des moyennes

end

for i = 1:length(Ph2)

M2 = M2 + T(Ph2(i),2)*A(Ph2calibre(i+1), Ph2calibre(i));

end

end

This is my code. A is a 1976x1976 matrix, and T is a 78x2 matrix.

This program should return two averages, M1 and M2.

This is not my first program, I tried to modify it by iniatializing every variables and by using easier commands but I didn't success. Does someone have an idea of what's my problem ?

Here is the simulink code and the error message :

An error occurred while running the simulation and the simulation was terminated

Caused by:

• Index exceeds matrix dimensions. The array Ph1 is empty and therefore has no valid indices. Error in 'simulinktest/MATLAB Function' (line 33) Ph1 = [Ph1, Ph1(end)+1]; Error in 'simulinktest/MATLAB Function' (line 33)

Answer 1

[Alagu Sankar Esakkiappan]

I gather that you are trying to use a MATLAB function to process inputs into two Averages. MATLAB function works the same on both MATLAB as well as Simulink platform. The empty Ph1 array problem may arise due to an unexpected data range in tabtheta i.e, No element in tabtheta satisfies conditions mentioned in Code for assignment to Ph1.

Sample MATLAB function call that results in the above problem:

test_sortie(40,300,ones(78,2),ones(1976,1976)) % Results in Ph1 & Ph2 becoming empty arrays

To find out the exact edge case for Failure, A possible way would be to try repeating the same function call for different values of x in a for loop in MATALB. For easier debugging, Try creating a Breakpoint on the line where error is caused in MATLAB.