MATRIX COFACTOR
480 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Mariana
le 2 Fév 2012
Commenté : Walter Roberson
le 11 Oct 2021
I need to know a function to calculate the cofactor of a matrix, thank a lot!
7 commentaires
Walter Roberson
le 8 Oct 2021
I suspect that the English word would be "minor". The Spanish word "menor" can be translated as English "minor" in some situations.
Réponse acceptée
Plus de réponses (2)
Dr. Murtaza Ali Khan
le 28 Sep 2019
A = [
2 4 1
4 3 7
2 1 3
]
detA = det(A)
invA = inv(A)
cofactorA = transpose(detA*invA)
2 commentaires
Franco Salcedo Lópezz
le 14 Nov 2019
Modifié(e) : Franco Salcedo Lópezz
le 14 Nov 2019
Here I leave this code, I hope it helps. Regards
function v = adj(M,i,j)
t=length(M);
v=zeros(t-1,t-1);
ii=1;
ban=0;
for k=1:t
jj=1;
for m=1:t
if ( (i~=k)&&(j~=m) )
v(ii,jj)=M(k,m);
jj++;
ban=1;
endif
endfor
if(ban==1)ii++;ban=0;endif
endfor
Francisco Trigo
le 6 Fév 2020
The matrix confactor of a given matrix A can be calculated as det(A)*inv(A), but also as the adjoint(A). And this strange, because in most texts the adjoint of a matrix and the cofactor of that matrix are tranposed to each other. But in MATLAB are equal. I found a bit strange the MATLAB definition of the adjoint of a matrix.
1 commentaire
Zuhri Zuhri
le 28 Sep 2021
adjoint matrix is the transpose of the cofactor matrix so the above result is correct
Voir également
Catégories
En savoir plus sur Logical 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!