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  1. function d = determinante(X)
  2. idx=1:size(X,1);
  3. for k=1:size(X,1)
  4.     if size(X,1)==1
  5.         d=X;
  6.     else
  7.         idxf=idx(idx~=1);
  8.         idxc=idx(idx~=k);
  9.         d(k)=((-1)^(1+k))*X(1,k)*determinante(X(idxf,idxc));
  10.         d=sum(d);
  11.     end
  12. end
  13. end
');