Reordering columns based on first row?
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Suppose I have a matrix:
A = [
5 4 1 2
0.5 0.7 0.1 0.9
0.9 0.4 0.3 0.2];
I'd like to use my first row as an index, so that my matrix is organized in an ascending order.
I know I can use sort:
[~,idx] = sort(A(1,:));
B = A(:,idx)
but this would give me a 3 by 4 matrix. I'd like a 3 by 5 matrix, such that the output looks like this:
1.0000 2.0000 0.0000 4.0000 5.0000
0.1000 0.9000 0.0000 0.7000 0.5000
0.3000 0.2000 0.0000 0.4000 0.9000
(doesn't have to be zeros as long as the column is empty)
I'd appreciate any help with this--thanks so much in advance!
0 commentaires
Réponse acceptée
Voss
le 8 Nov 2022
Using the elements of the first row of A as column indices in B:
A = [
5 4 1 2
0.5 0.7 0.1 0.9
0.9 0.4 0.3 0.2];
B = zeros(size(A,1),max(A(1,:)));
B(:,A(1,:)) = A
2 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Shifting and Sorting Matrices 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!