The main page credits Ricard Marxer for contibuting "Reverse", which according to some googling can be used to perform what in Matlab is called fliplr and flipud. I am, however, unable to locate anything about it in the current documentation. Did it not make the cut for Eigen 2.x?

don't worry, this feature is still there and documented:

http://eigen.tuxfamily.org/dox-devel/cl ... ce4b4649e2

Maybe it is only absent from the tutorial.