Saving matrices within a cell

Hello!

I want to save all the variable matrices "matrix_points" (which I create inside the function "function_main.m") inside a cell.

I hope I can explain myself better...

I have these lines of code:

X      % matrix [rows x 2 columns] double
matrix_points = function_main(X);

Within the function "function_main.m" there is this part of code where I then derive "matrix_points":

count_rows = height(px); % px is an array count_rows x columns

if count_rows == 2 
    
    matrix_points = function_1(input);
    
elseif count_rows == 3
    
    matrix_points = function_2(input);
    
elseif count_rows == 4 
    
    matrix_points = function_3(input);

end

I want to save all the variable matrices "matrix_points" (which I create inside the function "function_main.m") inside a cell.

Answer 1

[Image Analyst]

Initialize your matrix for all the matrixes

allMatrixes = {};

Then after your if block just append your latest matrix:

allMatrixes = [allMatrixes; {matrix_points}];

[Alberto Acri]

Do you mean in the following way?

X      % matrix [rows x 2 columns] double
matrix_points = function_main(X);

Within "function_main.m":

count_rows = height(px); % px is an array count_rows x columns

allMatrixes = {};

if count_rows == 2 
    
    matrix_points = function_1(input);
    
elseif count_rows == 3
    
    matrix_points = function_2(input);
    
elseif count_rows == 4 
    
    matrix_points = function_3(input);
end

allMatrixes = {allMatrixes; matrix_points};

[Image Analyst]

Yes. Presumably that is in a loop or somehow called several times so that you'll have more than just one cell.

[Alberto Acri]

OK, but it didn't work :/

[Image Analyst]

Try this. It should work.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;

allMatrixes = {};
for k = 1 : 4
    % Create sample px
    numPxRows = 1 + randi(3);
    px = rand(numPxRows, 2);
    count_rows = height(px); % px is an array count_rows x columns
    inputArgument = randi(10);
    if count_rows == 2
        fprintf('count_rows = 2 so calling function_1(%d).\n', inputArgument)
        matrix_points = function_1(inputArgument);
    elseif count_rows == 3
        fprintf('count_rows = 3 so calling function_2(%d).\n', inputArgument)
        matrix_points = function_2(inputArgument);
    elseif count_rows == 4
        fprintf('count_rows = 4 so calling function_3(%d).\n', inputArgument)
        matrix_points = function_3(inputArgument);
    end
    fprintf('   Adding a cell with a %d element vector in it.\n\n', length(matrix_points))
    allMatrixes = [allMatrixes; {matrix_points}];
end
% Display it
celldisp(allMatrixes)

%===========================================================================
% Define all functions below.
function output = function_1(n)
output = rand(1, n);
end
function output = function_2(n)
output = 2 * rand(1, n);
end
function output = function_3(n)
output = 3 * rand(1, n);
end