MATLAB: Adding lines and columns

copying lines columms

Hello, i have a matrix W (418*413) in the borders i have zeros, i mean in (1,:), (:,1),(:,413),(418,:) they are equal to zero and on the inside off the matrix i have values. What i need to do is, copy all the valeus from line 2 till line 417 from colummn 3 and put it on colummn 1 in the matrix W.

Thanks in advance

Best Answer

W(2:417,1) = W(2:417,3);

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MATLAB: HELP copy matrix and inserting in another matrix

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.

MATLAB: Cycle For how can i?

If i fully understand the question, below is the "cycle for loop" that you want,

 for idrow = 2:size(W,1)-1
    for idcol = 2:size(W,2)-1
       do stuff
    end
 end

Best Answer

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MATLAB: HELP copy matrix and inserting in another matrix

MATLAB: Cycle For how can i?

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