Dear Allin,
In the "eigengen" function help we have:
(...)
If a non-null second argument is given, the specified matrix will be
over-written with the auxiliary result. (It is not required that the
existing matrix be of the right dimensions to receive the result.) It will
be organized as follows:
(...)
When you say "It will be organized as follows", are you talking about the
matrix that the function will output (A) or the existing matrix (U)?
Best regards,
Henrique Andrade