How to build matrix

Dear all! I have the following problem. I have 4 values A,B,C,D each value has the size [3 x 1000]. A need to built matrix [A B; C D], which M [A(m,n) B(m,n); C(m,n) d(m,n)]. How to do it? NOw I have only the last result the code I have now :

if true
  freq_points= 1000;
n = 3;
A = zeros(n,freq_points);
B = zeros(n,freq_points);
C = zeros(n,freq_points);
D = zeros(n,freq_points);
B = ones (n, freq_points);
for r =1:3
for la = 1:1:freq_points;
A(r,:) = exp(gamma(r,:).*d(r)); 
B(r,:) = 1;
C(r,:) = exp((-gamma(r,:)).*d(r))*(1/Z(r)); 
D(r,:) = -1/Z(r);
M = [A(r,la)  B(r,la); C(r,la) D(r,la) ]
end;
end

[dpb]

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[Image Analyst]

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Answer 1

[Image Analyst]

Take M outside the loop and do

M = [A B; C D];

So M is only created after A, B, C, and D have finished being created.

[Yulia]

in this case I have the answer with dimension[6:2000]. And it looks like :[A(1) A(2) A(3) D(1)D(2)D(3) ]

Answer 2

[Yulia]

I decided to make like this:

if true
  for r = 1:3
  for la = 1:1:freq_points
A(r,:) = exp(gamma(r,:).*d(r)); 
B(r,:) = 1;
C(r,:) = exp((-gamma(r,:)).*d(r))*(1/Z(r)); 
D(r,:) = -1/Z(r);
%D(r) = [D(r)];
M = [A(r,la)  B(r,la); C(r,la) D(r,la) ];
FG (:,:,la) = M;
end
But now I do not know how to save all this  all the matrices for r=1, r=2, r=3. NOw i can have only r = 3