Extract sub-matrices from a big matrix
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
androidguy
am 29 Mär. 2017
Kommentiert: androidguy
am 29 Mär. 2017
I have an example matrix like the one given below. Original size of my matrix is (83193 x 2). I want extract every 2 rows and make a 2 x 2 matrix from this big matrix. For example:
[1 2
3 4
5 6
7 8
9 10
11 12]
Changed into:
A = [1 2; 3 4]
B = [5 6; 7 8]
C = [9 10; 11 12]
How can I do this operation?
Thanks!
0 Kommentare
Akzeptierte Antwort
Jan
am 29 Mär. 2017
X = rand(83193, 2);
s1 = size(X, 1);
XX = X(1:s1 - rem(s1, 2), :); % Number of blocks needs to be multiple of 2
Y = permute(reshape(XX, 2, [], 2), [1, 3, 2]);
Now Y(:, :, i) is the i.th 2x2 matrix. This is much more efficient than creating 41596 variables.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Logical finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!