MATRIX COFACTOR
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Mariana
el 2 de Feb. de 2012
Comentada: Walter Roberson
el 11 de Oct. de 2021
I need to know a function to calculate the cofactor of a matrix, thank a lot!
7 comentarios
Walter Roberson
el 8 de Oct. de 2021
I suspect that the English word would be "minor". The Spanish word "menor" can be translated as English "minor" in some situations.
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Dr. Murtaza Ali Khan
el 28 de Sept. de 2019
A = [
2 4 1
4 3 7
2 1 3
]
detA = det(A)
invA = inv(A)
cofactorA = transpose(detA*invA)
2 comentarios
Franco Salcedo Lópezz
el 14 de Nov. de 2019
Editada: Franco Salcedo Lópezz
el 14 de Nov. de 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
el 6 de Feb. de 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 comentario
Zuhri Zuhri
el 28 de Sept. de 2021
adjoint matrix is the transpose of the cofactor matrix so the above result is correct
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