From eigen 2.X to 3.0, we removed the minor(int,int) method because it implied a double branching inside its coeff(i,j) method. However, with evaluator, it is now very easily to efficiently implement copy of a minor to another matrix, so we could think about resurrecting it?
See also: https://forum.kde.org/viewtopic.php?f=74&t=117644
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