Simulink implementation of Matlab Code

I am trying to implement the following frame generation code in simulink. In summary the code does the following:

• Reads excel spreadsheet (which contains two columns, 1)time stap, 2)flight number)
• Starts a cycle, using the while statement, this is to mimic the passage of time
• Converts the two inputs into binary, concatenates them together and adds them to a frame (array)
• Every 10 cycles a new frame is created into which more inputs are add

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%555

clc;

%Initialisation of variables

x_count=1;

y_count=1;

frame=[];

t=readtable('Depart.csv');

A=table2array(t);

cycle_count=1;

start=610;

index=int64(A(x_count,1));

frame_index=1;

filename='Write_To.csv';

%this is the time cycle which runs from 6am to 11:30pm and increases by one

%minute every cycle. Starting at 601 to allign with cycle_count (which

%starts at 1 as well)

for time=601:2330

time;

cycle_count;

%The reason for using a while loop here is because multiple

%flights occure at the stame time.

while index<=time

%Table extraction (bit containting: time and flight no.)

x=de2bi(int64(A(x_count,1)), 24);

y=int64(A(x_count,2));

y_shift=bitshift(y,12);

d=de2bi(y_shift, 24);

final=x+d;

%adds the binary values of the x and y data to the frame

%sequencially

for i=1:length(final)

%adds single bit to the frame

frame(frame_index)=final(i);

frame_index=frame_index+1;

end

%Update variables

x_count=x_count+1;

index=int64(A(x_count,1));

end

%If the count has reached 10 we are going to reset the frame to

%be empty

if cycle_count==10

time

disp('Printing frame at end of cycle');

frame

disp('Resetting cycle count');

frame=[];

frame_index=1;

end

if cycle_count==10

cycle_count=1;

else

cycle_count=cycle_count+1;

end

end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The trouble that I am having with this is that I cannot simply copy and paste this code into a matlab function block in simulink.

The main problem at the moment is how to store multiple values in a frame in simulink, not just the latest input. Would implementing this using a Matlab System block in simulink work? If so how would I write it?

Hopefully this makes sense.

Thanks

Answer 1

[Samatha Aleti]

According to my understanding you want to store the output value “final” at each time step in an array instead of just saving the recent value, inside a MATLAB block function. One of the ways to do this is to define “frame” as “persistent” in the MATLAB block function as follows:

function [count] = fcn(in, count) 
    count = count + 1; 
    persistent frame 
    if isempty(frame) 
        frame = in; 
    else 
        frame = [frame, in]; 
    end 
    % reset
    if count == 10 
        count = 1; 
        frame = []; 
    end 
end

Hope this helps!