MATRIX COFACTOR

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Mariana
Mariana 2012-2-2
编辑： Walter Roberson 2024-12-26
I need to know a function to calculate the cofactor of a matrix, thank a lot!
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Natasha St Hilaire
Natasha St Hilaire 2021-10-7
What is "menor" short for?
Walter Roberson
Walter Roberson 2021-10-8
@Natasha St Hilaire
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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采纳的回答

Walter Roberson
Walter Roberson 2012-2-2
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Mariana
Mariana 2012-2-7
Yes, I right-click on the shortcut and select to run as administrator. And I save the function on the lib file, and the function work with matrix.. But when I close and open again the function when I try to use the function a message say that it is Undefined..
Mariana
Mariana 2012-2-7
Walter,
I thing I get it.. I forget to add the function to the PATH through the SET PATH in the menu file.. Thank you very much for all..
Just one question more.. Matlab run in linux? what distribution is better?

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更多回答（2 个）

Dr. Murtaza Ali Khan
A = [
2 4 1
4 3 7
2 1 3
]
detA = det(A)
invA = inv(A)
cofactorA = transpose(detA*invA)
  2 个评论
Franco Salcedo Lópezz
Franco Salcedo Lópezz 2019-11-14
编辑：Franco Salcedo Lópezz 2019-11-14
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
Walter Roberson
Walter Roberson 2021-10-11
This is not MATLAB code. It might be Octave.

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Francisco Trigo
Francisco Trigo 2020-2-6
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.
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Zuhri Zuhri
Zuhri Zuhri 2021-9-28
adjoint matrix is ​​the transpose of the cofactor matrix so the above result is correct

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