I want to divide an array into x number of smaller arrays of size [m x n] (where x is = m *n) and then using a for loop fill those smaller arrays with the same value

I have an array that is 6 x 8, I want a user to be able to input 2 values, a # of rows (m) and a # of columns (n), ex x = zeros(2,3) and then the larger array is divided into m*n sections each of size [m,n] and in a for loop for 1:m*n the user can input values for x and those values are then inplemented into the corresponding section of the larger array. I want to keep the large array all as one, I just need an easy way to input the same value into multiple cells at once.

rows = 8;
columns = 6;
layout = zeros(rows,columns);
%n = input(['How many horizontal replicates are there']); ex. 
%m = input(['How many vertical replicates are there']); ex.
n = 3;
m = 2;
sections = m*n;

%need to now divide 'layout' into sections which each have a size of [m,n]

for i = 1:sections
    %x = input(['What is the value in section ' num2str(i), '?' ]); ex. 
    
    %the value of x is now filled into the [m x n] array of the i section
    x = i+1;
    % layout [???] = x;
end

Thanks!

Answer 1

[Stephen23]

Changing your perspective on this problem would make it easier.

A much simpler approach would be to use REPELEM:

U = [3,9,6;2,7,9] % user values (if required use a simple loop to enter the values)

U = 2×3

3 9 6 2 7 9

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

S = [2,3] % size of each tile

S = 1×2

2 3

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

M = repelem(U,S(1),S(2))

M = 4×9

3 3 3 9 9 9 6 6 6 3 3 3 9 9 9 6 6 6 2 2 2 7 7 7 9 9 9 2 2 2 7 7 7 9 9 9

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

Answer 2

[Sahas]

Hi @Grace,

As per my understanding, it seems there are two tasks at hand. First, you want to split a larger array into m*n number of smaller arrays, each with dimensions m*n as well. Second, you aim to iterate over these sections in the larger array and populate them with the corresponding values from the smaller arrays.

Refer to the following code snippet which takes a different approach and eventually gets the requirements and takes in input from the user as well:

% Define the dimensions of the layout
rows = 8;
columns = 6;
layout = zeros(rows, columns);

% Prompt the user for the number of vertical and horizontal replicates
m = input('Number of rows in the section: ');
n = input('Number of cols in the section: ');
sections = m*n;

% Initialize the small_array to store user inputs
small_array = zeros(1, sections);

for i = 1:sections
    small_array(i) = input(['Enter value for element ' num2str(i) ': ']);
end

% Creating sections
section_array = reshape(small_array, m, n);
disp(section_array)

% Use repelem to create a repeated pattern
C = repelem(section_array', m, n);
disp(C)

% Overlap C on the layout, if required
layout(1:size(C, 1), 1:size(C, 2)) = C;
disp(layout);

For more information on MATLAB's "repelem" function, refer to the following MathWorks documentation link:

• https://www.mathworks.com/help/matlab/ref/repelem.html

Hope this is beneficial!