Why I get an error when generating a cell array as an output of a simulink function?

function y = (input,vector)
    persistent count
    persistent array_3
    persistent array_2
    persistent array_1
    persistent Matrix
    
    if isempty (array_3) 
       array_3 = cell(1000,2); 
       %array_3 = cell(repmat({zeros(1,9)}, 100, 1),repmat({zeros(1,9)}, 100, 2));
       count = 0;
       array_1 = zeros(1,9);
       array_2 = zeros(500,16);
    end   
        
    %Merge
    Matrix(1:500,1:15)= data;
    Matrix(1:500,16)= input;
    
    %Look through the data
    peak = find(Matrix(:,16)== 1);
    val = length(peak);
    
    if val > 5
        Counter = Counter + 1; 
        array_3{Counter,1} = array_1;
        array_3{Counter,2} = array_2;
    end
        
 y = array_3;

Error:

Simulink does not have enough information to determine output sizes for this block. If you think the errors below are inaccurate, try specifying types for the block inputs and/or sizes for the block outputs.

Component:MATLAB Function | Category:Coder error

Cell arrays as top-level function outputs are not supported in MATLAB Function Block. Output 'Output' is a cell array.

Answer 1

[Mark McBroom]

First, it looks like you ahve a typo... should "Counter" be "count"? But that isn't the reason for the error. I think the problem is that even though your code says the kength of array_3 is 1000, the body of the code can go beyond 1000. Try changing this line to be:

if val > 5 && count < 999

Thanks.

Mark.