how in matrix insert other matrix

hi how in matrix insert other matrix? for example I have:

A=repmat(2, [6 6]);
B=repmat(1, [4 4]);

How I can insert B to A and get it:

A=
2 2 2 2 2 2
2 1 1 1 1 2
2 1 1 1 1 2
2 1 1 1 1 2
2 1 1 1 1 2
2 2 2 2 2 2

Answer 1

[Razvan]

Try

[r,c]=size(B);
xpos=2;ypos=2;
A(xpos:xpos+r-1,ypos:ypos+c-1)=B;

, where xpos and ypos are the positions where you want to insert matrix B.

[Modestas Sekreckis]

and how to choose the elements of the matrix A. who =1 and write it in other matrix for example

C=

2 2

2 3

2 4

2 5

3 2

3 3

etc.

[Razvan]

[row,col] = find(A==1);

will give you the row/column indices of the elements. If you want them in a matrix C, use C=[row,col]; after that

[Modestas Sekreckis]

but I forgot to say one small detail, I use a 3D matrix in a real program. How then does it work?

[Razvan]

[x,y,z]=ind2sub(size(A),find(A==1));

Answer 2

[Ben Mitch]

A(2:5,2:5) = B;