Increase nonzero values without deleting zeros
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
monmatlab
le 12 Avr 2017
Commenté : David J. Mack
le 12 Avr 2017
I have a vector X.
X=[0 0 0 0 1 1 1 1 0 0 0 0 0 0 2 2 2 2 2 2 0 0 0 3 3 3 3 0 0 0 0 0 4 4 4]
I want to increase the values of the nonzero elements in vector X by 10 However, when I do this using the find function I end up just having a vector without the zeros.
Y=X((find(X~=0)))+10;
Y=[11 11 11 11 22 22 ... ]
Is there a way to do this without using a for loop?
2 commentaires
Réponse acceptée
David J. Mack
le 12 Avr 2017
Modifié(e) : David J. Mack
le 12 Avr 2017
Hey monmatlab, simply use logical indexing:
Y = X;
isNonzero = X~=0;
Y(isNonzero) = 10*Y(isNonzero);
or the more compact inplace replacement:
X(X~=0) = 10*X(X~=0);
Greetings, David
2 commentaires
Adam
le 12 Avr 2017
If this is what you actually want to do, with multiplication then you can just skip the logical part and use
X = X * 10
since multiplying by 0 is 0 anyway! I was under the impression you wanted to add 10, not multiply by it though.
David J. Mack
le 12 Avr 2017
Ah true, the OP stated to increase it... but it's the same idea anyway. Just replace the * by a +.
Plus de réponses (1)
Voir également
Catégories
En savoir plus sur Loops and Conditional Statements 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!