Nested loop - storing vectors into matrix

Hello,

I would like to store each vector from a loop a matrix (27 rows).

The current code creates the 27 vectors but overwrites previous vectors. How I can save the vector from each run into a matrix? The file exchange demo solution does not work.

%% ONLINE VERSION

    clear all

% Random numbers in vector

    r = random('Uniform',1,10,1,10);
    u = sort(r) % here redundant

% Fixed parameters

    k = 1;
    l = 1;
    m = 1;

% Creating a matrix based on vectors for each parameter change

    a = [0 1 2];
    b = [0 1 2];
    c = [0 1 2];

% Vector with parameter a_i, b_i, c_i

% Creating loop

    for i=1:length(a)
       for j=1:length(b)
           for f=1:length(c)
               xDL = k + a(i) + (l + b(j))*u*(m + c(f))
               lxDL = [xDL a(i) b(j) c(f)]
         end
     end    
  end

Thanks!

[Rick Rosson]

Please format your code by inserting two blank spaces at the beginning of each line of code. Thanks!

[Tom]

Updated, thanks.

Answer 1

[Walter Roberson]

Before the loop, set

lxDL = [];

Change

lxDL = [xDL a(i) b(j) c(f)]

to

lxDL = [lxDL; xDl a(i) b(j) c(f)];

[Walter Roberson]

Note: this will be pretty inefficient in general. Much more efficient for computation (but not for memory) would be

[A B C] = ndgrid(a,b,c);

lxDL = k + A(:) + (l + B(:)).*u.*(m + C(:));

lxDL(:,2:4) = [A(:), B(:), C(:)];