How to index all columns but one in a matrix?
98 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi!
I want to do index/use all columns in a matrix but a single one, so for example:
A=[1 2 3 4; 1 2 3 4; 1 2 3 4] and I 'd like to get at B=[1 2 4; 1 2 4; 1 2 4].
A long way to that would be: B=[A(:,1:2),A(:,4)], but is there anything faster/built in?
Best Peter
0 commentaires
Réponse acceptée
James Tursa
le 2 Août 2013
B = A;
B(:,3) = [];
7 commentaires
James Tursa
le 3 Août 2018
Because [1 1 0 1] is not a logical vector and you are not accounting for both dimensions. E.g., compare your code to this:
X(:,logical([1 1 0 1]))
Plus de réponses (1)
David Sanchez
le 2 Août 2013
% no need of a new matrix, remake the old one:
A = exp(A(:,[1:2,4]));
0 commentaires
Voir également
Catégories
En savoir plus sur Matrix Indexing 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!