How to store multiple arrays into a single one?

array_1 = zeros(1,9);
array_2 = zeros(500,16);

With the increase in time I will be concatenating arrays one and two into array3. I tried it by doing this:

array_3 = [array_1,array2];

Since, they are not from the same size, they can´t be concatenated.

Any ideas on how can I save them?

Answer 1

[Stephen23]

Use a cell array:

C = {array_1,array_2}

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

[Mariana]

Is it better to use an cell array or an structure?

When I create a structure as an output of a matlab function in my simulink. I get an error that I need to create a bus object.

%Initialize array
array_3 = cell(100,2);
array_3 {Counter,1} = array_1;
array_3 {Counter,2} = array_2;

I get this error if I try it the with cell arrays.

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.

[Stephen23]

"Is it better to use an cell array or an structure?"

It depends entirely on what you are doing:

• if your data have an inherent sequence, then use a container array which can be accessed using indices (e.g. cell array, non-scalar structure, table rows).
• if your data are best identified by parameter names, then use a container array which lets you use names (e.g. structure, table columns).

Use the simplest data type that can reasonably hold your data, as this will simplify your code.

[Mariana]

How to initialize the cell array?

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.