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54 lines
1.5 KiB
Fortran
54 lines
1.5 KiB
Fortran
4 years ago
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module amg_s_pde2d_box_mod
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_), save, private :: epsilon=sone/80
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contains
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subroutine pde_set_parm(dat)
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real(psb_spk_), intent(in) :: dat
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epsilon = dat
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end subroutine pde_set_parm
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!
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! functions parametrizing the differential equation
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!
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function b1_box(x,y)
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_) :: b1_box
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real(psb_spk_), intent(in) :: x,y
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b1_box = sone/1.414_psb_spk_
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end function b1_box
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function b2_box(x,y)
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_) :: b2_box
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real(psb_spk_), intent(in) :: x,y
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b2_box = sone/1.414_psb_spk_
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end function b2_box
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function c_box(x,y)
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_) :: c_box
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real(psb_spk_), intent(in) :: x,y
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c_box = szero
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end function c_box
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function a1_box(x,y)
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_) :: a1_box
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real(psb_spk_), intent(in) :: x,y
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a1_box=sone*epsilon
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end function a1_box
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function a2_box(x,y)
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_) :: a2_box
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real(psb_spk_), intent(in) :: x,y
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a2_box=sone*epsilon
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end function a2_box
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function g_box(x,y)
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use psb_base_mod, only : psb_spk_, szero, sone
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real(psb_spk_) :: g_box
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real(psb_spk_), intent(in) :: x,y
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g_box = szero
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if (x == sone) then
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g_box = sone
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else if (x == szero) then
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g_box = sone
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end if
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end function g_box
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end module amg_s_pde2d_box_mod
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