Creation of double columns whose max size is 2 x 2 from a matrix whose size is n>2 x n>2 ( e.g. with n max = 800)
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I need your help. Here is an example of what I want to do:
B = [1 2 3; 4 5 6; 7 8 9]
[m,n] = size(B);
B(m-2:m-1, n-2:n-1)
B(m-1:m , n-2:n-1)
B(m-2:m-1, n-1:n)
B(m-1:m , n-1:n)
Input:
B =
1 2 3
4 5 6
7 8 9
Output:
ans =
1 2
4 5
ans =
4 5
7 8
ans =
2 3
5 6
ans =
5 6
8 9
Can you please show me how I can do this or give me an example to do it automatically, for example for a larger matrix such as B = magic(10) or more?
Thank you!
2 commentaires
James Tursa
le 19 Déc 2017
These can easily be created, but what do you intend to do with these sub-matrices downstream in your code? There may be a way to do this downstream processing without physically creating all of these sub-matrices.
Réponse acceptée
Harish Ramachandran
le 20 Déc 2017
Modifié(e) : Harish Ramachandran
le 20 Déc 2017
B = rand(2,4);
count = 1;
[xdim ydim] = size(B);
for i=1:xdim-1
for j=1:ydim-1
C{count} = B(i:i+1,j:j+1);
count = count+1;
end
end
In this case, the resultant output will be a cell array with each cell block (C{1}, C{2}...) a distinct 2x2 sub component of the input matrix.
4 commentaires
Harish Ramachandran
le 20 Déc 2017
Also, I have edited the code above to make sure it works for non square matrix.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Messages dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!