confusing regarding two cases of multiplication in MATLAB?
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
ABTJ
le 16 Fév 2020
Réponse apportée : Steven Lord
le 16 Fév 2020
I know that in MATLAB,we use ".*" and"*" for multiplication of matrices
But when one should use only "*" and when one should also use dot with asterik ".*" ??
Please kindly explain with examples
Especially if one operand is a scalar or 1X1 matrix and 2nd matrix is a row vector or column vector? In that case ,only asterik"*" will be sufficent?
0 commentaires
Réponse acceptée
Jesus Sanchez
le 16 Fév 2020
".*" -> Element-wise multiplication
Example:
[1 2 3].*[1 2 3] = [1*1 2*2 3*3] = [1 4 9]
"*" -> Matrix multiplication
Example:
[1 2 3]*[1 2 3].' = [1*1 +2*2 +3*3] = [1+4+9] = [14]
2 commentaires
Image Analyst
le 16 Fév 2020
In the case where one variable is a scalar, either * or .* would work, though I, and I expect most other people, use only * (without the unneeded dot).
Plus de réponses (1)
Steven Lord
le 16 Fév 2020
See this documentation page for a discussion of the difference between array operations and matrix operations, including examples showing what each does.
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!