Multiply each column of n-by-m matrix by respective constants in m-by-1 vector
13 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi
I have an n-by-m matrix and an m-by-1 vector. I want to multiply each of the m columns in the matrix by a constant specified in my vector.
E.g. if I have a matrix A=[1,2;3,4;5,6] and a vector B=[0.5,2] I want to multiply all the elements in the first column of my matrix by 0.5 and alle the elements en the second column by 2. That is, I would like to get the result C=[0.5,4;1.5,8;2.5,12].
It can easily be done by a loop, but I would like to know if the is a faster way to do this. A built in functionality? Dot-multiply doesn't seem to do the trick :(
Thanks in advance!
- Jesper
0 commentaires
Réponse acceptée
Plus de réponses (2)
vlad ap
le 22 Juil 2021
This also works:
C = B.*A
2 commentaires
Steven Lord
le 23 Juil 2021
This works now due to implicit expansion. It would not have worked when the question was first asked in 2012.
Jesper
le 21 Jan 2012
1 commentaire
the cyclist
le 21 Jan 2012
Happy to help. For future reference, you might want to add a remark like this as a "comment" to an answer (like I did here), rather than as a separate "answer". On questions that have more activity than this one, it helps to keep things organized logically.
Voir également
Catégories
En savoir plus sur Axis Labels 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!