MATLAB: Combination of sub-matrices generated within a for loop

Question

clear;
clc;
close all;
n=[3 1 2];
rad=[0.04 0.02 0.01];
h=[10 12 15];
for kk=1:length(n)
    matrix=zeros(n(kk),n(kk));
    for ii=1:n(kk)
        for jj=1:n(kk)
            val=rad(kk)*h(kk);
            matrix(ii,jj)=val;
        end
    end
end
% Dear users, if you put a debug at the very last "end" (row 17), you can
% see that I aim to generate 3 sub-matrices having the size of 3x3, 1x1 and
% 2x2 (see n=[3 1 2]). I want to combine each sub-matrix one each other diagonally.
% I want to get the matrix as a result below:
matrix=[0.4 0.4 0.4 0 0 0;0.4 0.4 0.4 0 0 0;0.4 0.4 0.4 0 0 0;0 0 0 0.24 0 0;0 0 0 0 0.15 0.15;0 0 0 0 0.15 0.15];
%Is there any simple way to do it?
%Thanks in advance!

Answer 1

Hello,

There are various solutions for this question, one of the closet one to your current code could be

clear;
clc;
close all;
n=[3 1 2];
rad=[0.04 0.02 0.01];
h=[10 12 15];
matrix = zeros(sum(n));
for kk=1:length(n)
%     matrix=zeros(n(kk),n(kk));
    for ii=1:n(kk)
        for jj=1:n(kk)
            val=rad(kk)*h(kk);
            matrix(ii+sum(n(1:kk-1)),jj+sum(n(1:kk-1)))=val;
        end
    end
end