Storing multiple matrices created by multiple executions of a function

I have a recursing function that outputs four matrices when the recursion stops. The problem is that (because it's a recursing function) the function runs multiple times simultaniously so I at the end I get a set of four matrices from each finishing function but I don't know from which function it's originating. So my command window shows:

A1 = .. A2=... A3=.. A4=.. A1=.. A2=.. A3=.. ...etc. Where A1, A2, A3 & A4 are the four matrices named by the function. Is there a way to index or store them so that I can acces each matrix individually (my goal is to put them all into one big matrix)?

Thanks for reading!

Answer 1

[Stephen23]

Method one: input/output arguments:

function [A,B] = mainfun(N)
[A,B] = recfun(N,{},{});
end
function [A,B] = recfun(N,A,B) % local function
if N>0
    A{end+1} = 1:+1:N; % output data
    B{end+1} = N:-1:1; % output data
    [A,B] = recfun(N-1,A,B); % recursion
end
end

And tested:

>> [X,Y] = mainfun(4);
>> X{:}
ans =
  1  2  3  4
ans =
  1  2  3
ans =
  1  2
ans =
  1
>> Y{:}
ans =
  4  3  2  1
ans =
  3  2  1
ans =
  2  1
ans =
  1

Method two: nested function:

function [A,B] = mainfun(N)
A = {};
B = {};
recfun(N);
    function recfun(N) % nested function
    if N>0
        A{end+1} = 1:+1:N; % output data
        B{end+1} = N:-1:1; % output data
        recfun(N-1); % recursion
    end
    end
end

And tested:

>> [X,Y] = mainfun(4);
>> X{:}
ans =
  1  2  3  4
ans =
  1  2  3
ans =
  1  2
ans =
  1
>> Y{:}
ans =
  4  3  2  1
ans =
  3  2  1
ans =
  2  1
ans =
  1