9.2 Reading sorted AO integrals

      logical function ao_integral_available ()

says whether or not sorted ao integrals are currently available.

      subroutine ao_integral_status(new_basis,new_geometry,
     >                        new_symmetry,new_charges)

returns detailed information about status of current AO integrals:

new_basis=-1

no basis set available

new_basis=0

basis unchanged since last integral evaluation

new_basis=1

basis changed since last integral evaluation

new_geometry=-1

no geometry or no integrals available

new_geometry=0

geometry unchanged since last integral evaluation

new_geometry=1

geometry or number of centers changed since last integral evaluation

new_symmetry=-1

no symmetry info or no integrals available

new_symmetry=0

symmetry unchanged since last integral evaluation

new_symmetry=1

symmetry or number of centers changed since last integral evaluation

new_charges=-1

no nuclear charges or no integrals available

new_charges=0

nuclear charges unchanged since last integral evaluation

new_charges=1

nuclear charges or number of centers changed since last integral evaluation

      subroutine zmat_save

saves geometry and symmetry information for current integrals

      subroutine basis_check(new_basis)

saves basis information for current integrals and updates basis records.

Output:

new_basis=-1

no integrals available

new_basis=0

basis unchanged since last integral evaluation

new_basis=1

basis changed since last integral evaluation

c-----------------------------------------------------------------------
      subroutine ao_integral_reserve (n_integral,ifile,irec)
c-----------------------------------------------------------------------

ifile_aoint_, irec_aoint are set by default to 1, 1300 but can be changed any time after the first call to ao_integral_reserve by responsible programmers.