MATLAB: HELP copy matrix and inserting in another matrix

inserting matrix

Hello guys, i have a matrix
U=(416,411)
and i need to make a matrix
W=zeros(416+2,411+2)
and then i need to copy the matrix U inside the matrix W, so the borders of this new matrix become full of zeros, or in anothers words matrix U surrended by zeros.
For example:
[0 0 0 0 ...
 0 1 1 0 ...
 0 0 0 0]
ยด
thanks in advance

Best Answer

W(2:end-1,2:end-1)=U;
using the fact size(W you already created is size(U)+2 and you wanted it centered. If it weren't centered, then the generic expression is written based on the size of U instead of W...
r1=2; c1=2  % row column starting points in target
[nr,nc]=size(U);  
r2=r1+nr-1: c2=c1+nc-1; % end positions in W
W(r1:r2,c1:c2)=U;
The rule is the size() of the LHS addressing expression has to match that of the RHS.
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