Split a matrix into smaller matrices based on another variable
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Daria Ivanchenko
am 21 Okt. 2020
Kommentiert: Ameer Hamza
am 21 Okt. 2020
Hi!
I have two variables, the size of each of them is 50x15179, one of them (A) insludes some specific numbers, the other one (B) has only zeros and ones in it. I want to divide the first variable A into smaller matrices (or cells) based on the appearance of ones in the variable B. How can I do this?
Just as an example,
A = [1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5];
B = [1 0 1 0 0; 1 0 1 0 0; 1 0 1 0 0; 1 0 1 0 0; 1 0 1 0 0];
I want to get two separate matrices like:
C = [1 2; 1 2; 1 2; 1 2; 1 2];
D = [3 4 5; 3 4 5; 3 4 5; 3 4 5; 3 4 5;]
Thank you!
0 Kommentare
Akzeptierte Antwort
Ameer Hamza
am 21 Okt. 2020
If you have multiple 1s in a row of your B matrix, then creating variable names like C, D, .. is not advisible: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval. It is better to use cell arry.
Try the following code
A = [1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5];
B = [1 0 1 0 0; 1 0 1 0 0; 1 0 1 0 0; 1 0 1 0 0; 1 0 1 0 0];
grps = cumsum(B, 2);
C = cell(size(A,1),1);
for i = 1:numel(C)
C{i} = splitapply(@(x) {x}, A(i,:), grps(i,:));
end
If number of 1s are equal in each row then you can also run the following
C = reshape([C{:}], [], numel(C)).';
2 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!