How to extract and replace from small matrix into big matrix without zeros. here is the code examples:

 A = round(abs(randn(10,10)*100));
 B = zeros(5,5);
 
 for i = 1:5
     for j = 1:5
         if(i>1 && i<5 && j>1 && j<5)
             B(i,j) = round(abs(randn(1)*100));
         end
     end
 end

 C = B>0==1;
 A(4:8,3:7) = B; % This is not a solution
disp(A);
%error
 A(4:8,3:7) = B(C); % This will be an array, not a matrix

Current answers:

A =
    78    28    55    24   132    15   211    30     5    95
   106   115    42    18    13   230    72    90    77    35
   177   115    36    24   144   275    28    63    79   160
    42    67     0     0     0     0     0     7   141    53
   105    67     0   130   101    79     0    19    53    85
    65    40     0    12    55    96     0    29   193   134
    32    67     0   163    76   119     0    99    18   250
   177    58     0     0     0     0     0    39    24    17
   151    78   104    84    23   113    38    19    90    35
    16   106    91   254   110     8    43    28    79    72

Note: zeros should be not there surounding it.

[Matt J]

Note: zeros should be not there surounding it.

If the zeros shouldn't be there, then what should be there instead?

[Lin Nuo]

The original values from matrix A before. Actually, the main point is to extract values from B relocate to A without zeros.

Answer 1

[Lino Garda Denaro]

D = zeros(10,10);

D(4:8,3:7) = B;

iD = D>0==1;

A(iD)=D(iD)

[Lin Nuo]

This is what I mean.