amg4psblas/samples/advanced/pdegen/amg_s_pde3d_base_mod.f90

!
!
!                             AMG4PSBLAS version 1.0
!    Algebraic Multigrid Package
!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
!
!    (C) Copyright 2021
!
!        Salvatore Filippone
!        Pasqua D'Ambra
!        Fabio Durastante
!
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!    are met:
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module amg_s_pde3d_base_mod
  use psb_base_mod, only : psb_spk_, sone, szero
  real(psb_spk_), save, private :: epsilon=sone/80
contains
  subroutine pde_set_parm3d_base(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
  end subroutine pde_set_parm3d_base
  !
  ! functions parametrizing the differential equation
  !
  function b1_base(x,y,z)
    implicit none 
    real(psb_spk_) :: b1_base
    real(psb_spk_), intent(in) :: x,y,z
    b1_base=szero/sqrt(3.0_psb_spk_)
  end function b1_base
  function b2_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  b2_base
    real(psb_spk_), intent(in) :: x,y,z
    b2_base=szero/sqrt(3.0_psb_spk_)
  end function b2_base
  function b3_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  b3_base
    real(psb_spk_), intent(in) :: x,y,z
    b3_base=szero/sqrt(3.0_psb_spk_)
  end function b3_base
  function c_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  c_base
    real(psb_spk_), intent(in) :: x,y,z
    c_base=szero
  end function c_base
  function a1_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  a1_base
    real(psb_spk_), intent(in) :: x,y,z
    a1_base=epsilon
  end function a1_base
  function a2_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  a2_base
    real(psb_spk_), intent(in) :: x,y,z
    a2_base=epsilon
  end function a2_base
  function a3_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  a3_base
    real(psb_spk_), intent(in) :: x,y,z
    a3_base=epsilon
  end function a3_base
  function g_base(x,y,z)
    implicit none 
    real(psb_spk_) ::  g_base
    real(psb_spk_), intent(in) :: x,y,z
    g_base = szero
    if (x == sone) then
      g_base = sone
    else if (x == szero) then
      g_base = sone
    end if
  end function g_base
end module amg_s_pde3d_base_mod