copy matrix and random it's value within certain range

i have recently post Copy certain number from one matrix to another. Similar to this, how can i change the value of a matrix random it within certain range? The result of matrix C and matrix D is based on matrix B value. For example

 A  B     C  D     %     C                          D
-------------      %
 1  1     1  1     %copy 1 to C                 copy 1 to D
 2  1     1  1     %copy 1 to C                 copy 1 to D
 3  3     3  3     %random 1 or 3.get 3         random 1 or 3.get 3
 4  3     3  1     %random 1 or 3.get 3         random 1 or 3.get 1
 5  3     1  1     %random 1 or 3.get 1         follow previous value. 1
 6  5     5  5     %copy 5                      random 1 or 5. get 5
 7  5     5  1     %copy 5                      random 1 or 5. get 1 
 8  4     4  1     %random 1 or 4.get 4         random 1 or 4. get 1
 9  4     1  1     %random 1 or 4.get 1         follow previous value. 1 
10  4     1  1     %follow previous value.1     follow previous value. 1
11  1     1  1     %copy 1 to C                 copy 1 to D
12  9     9  9     %copy 9 to C                 random 1 or 9. get 9
13  9     9  1     %copy 9 to C                 random 1 or 9. get 1
14  9     9  1     %copy 9 to C                 follow previous value. 1
15  3     3  3     %random 1 or 3.get 3         random 1 or 3. get 3
16  3     3  1     %random 1 or 3.get 3         random 1 or 3.get 1
17  3     1  1     %random 1 or 3.get 1         follow previous value. 1      
18  8     8  8     %copy 8                      random 1 or 8. get 8       
19  8     8  8     %copy 8                      random 1 or 8. get 8    
20  8     8  1     %copy 8                      random 1 or 8. get 1       
21  0     0  1     %copy 0                      random 1 or 0. get 0      
22  0     0  1     %copy 0                      follow previous value

Matrix A and B i already have. Matrix D is slightly have more 1 compare to C.

For matrix C :                    For matrix D
0 = 0,                              0 = 1,
1 = 1,                              1 = 1,
2 = random between 1 or 2,          2 = random between 1 or 2, 
3 = random between 1 or 3,          ...
4 = random between 1 or 4,          ...
5=5, 6=6, 7=7, 8=8, 9=9             9 = random between 1 or 9,

Whenever its random and get, the following value is also set to 1.

1   1  
3   3   %random
3   1   %random and get 1
3   1   %follow previous value
1   1   %copy 1  
3   3   %random again

Answer 1

[dpb]

Bmn=2; Bmx=4;                        % ranges for B 
ix=iswithin(B,Bmn,Bmx);              % rule for positions
C(ix)=(rand(size(B))>0.5).*B(ix);    % pick either B or 1, 50:50

Simply change the ranges for D

iswithin is my utility function

function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
%  [log] = iswithin(x,lo,hi)
%      returns T for x between lo and hi values, inclusive

flg= (x>=lo) & (x<=hi);

>>

that is often quite useful in cases such as this to remove the complexity of the logical expressions to a lower level making the top-level code much cleaner.