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=============== dav_general_mat =============== This modules allows to use the Davidson Algorithm for general squared symmetric matrices You have two options : a) the routine "davidson_general" to whom you pass the matrix you want to diagonalize b) the routine "davidson_general_ext_rout" to whom you pass the subroutine that realizes v = H u See the routines in "test_dav.irp.f" for a clear example.