[R]: fix a bug in eigensolver.
[R]: fix a bug in eigensolver.

flashxio/FlashX,flashxio/FlashX,icoming/FlashX,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashX,icoming/FlashX,zheng-da/FlashX,flashxio/FlashX,icoming/FlashX,zheng-da/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashGraph,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashGraph,zheng-da/FlashX,icoming/FlashGraph