How to create 3d array whose value follows a certain pattern without using for-loop?

How to create 3d array whose value follows a certain pattern without using for-loop?

For the following example, how to modify it to meet the requirement above?

A = zeros(m, n, 3);

for i = 1 : m

for j = 1 : n

A(i, j) = [i, j, i*j];

end

end

Answer 1

[Dyuman Joshi]

Your code will not run as you are trying to store 3 numeric values in 1 numeric place holder. I have corrected the code below

%Random values for example
m = randi(10)

m = 10

n = randi(10)

n = 5

A = zeros(m, n, 3);
for i = 1 : m
    for j = 1 : n
        %Correction
        %       v
        A(i, j, :) = [i, j, i*j];
    end
end

To get the same result without the for loop, utilize vectorization -

[M,N] = ndgrid(1:m,1:n);

%Concatenate individual arrays to make a 3D array
A0 = cat(3,M,N,M.*N);

%Check if the arrays are equal or not
isequal(A0,A)

ans = logical
   1