combination of two matrices

I have two matrices (160,12) in size. I want to put them in one matrix (320,12)by making the first 40 rows in matrix 1 following by the first 40 rwos in matrix 2, creating the first 80 rows of the new matrix. the second 40 rows in matrix 1 following by the second 40 rwos in matrix 2, creating the second 80 rows and so on.

Thank you in advance!!!

Answer 1

[James Tursa]

A = 160 x 12 matrix
B = 160 x 12 matrix
Ar = reshape(A',40*12,[]);
Br = reshape(B',40*12,[]);
result = reshape([Ar;Br],12,[])';

[Najiya Omar]

Amazing!! thank you James so so much

Answer 2

[John BG]

There is not need to reshape

   [szA1 szA2]=size(A);[szB1 szB2]=size(B);
    [A(:,[1:floor(szA2/2)]) B(:,[1:floor(szA2/2)]) A(:,[floor(szA2/2)+1:end]) B(:,[floor(szA2/2)+1:end])]

[Najiya Omar]

Thank you John, greatly appreciated such a wonderful answer

[John BG]

reshaping implies pulling all elements one by one, putting them in a long string, and then putting them back in the desired matrix shape.

Instead, by directly addressing a partial range of the original matrix oneu saves time that may be noticeable if the matrix is big.

Regards

John BG

<mailto:[e-mail] [e-mail]>

[James Tursa]

Reshaping a full matrix produces a shared data copy, not a deep data copy. So no elements get moved in memory at all.