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66 lines
1.9 KiB
Fortran
66 lines
1.9 KiB
Fortran
4 years ago
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module amg_s_pde3d_exp_mod
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use psb_base_mod, only : psb_spk_, sone
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real(psb_spk_), save, private :: epsilon=sone/160
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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_exp(x,y,z)
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use psb_base_mod, only : psb_spk_, szero
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real(psb_spk_) :: b1_exp
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real(psb_spk_), intent(in) :: x,y,z
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b1_exp=szero/sqrt(3.0_psb_spk_)
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end function b1_exp
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function b2_exp(x,y,z)
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use psb_base_mod, only : psb_spk_, szero
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real(psb_spk_) :: b2_exp
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real(psb_spk_), intent(in) :: x,y,z
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b2_exp=szero/sqrt(3.0_psb_spk_)
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end function b2_exp
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function b3_exp(x,y,z)
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use psb_base_mod, only : psb_spk_, szero
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real(psb_spk_) :: b3_exp
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real(psb_spk_), intent(in) :: x,y,z
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b3_exp=szero/sqrt(3.0_psb_spk_)
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end function b3_exp
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function c_exp(x,y,z)
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use psb_base_mod, only : psb_spk_, szero
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real(psb_spk_) :: c_exp
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real(psb_spk_), intent(in) :: x,y,z
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c_exp=szero
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end function c_exp
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function a1_exp(x,y,z)
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use psb_base_mod, only : psb_spk_
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real(psb_spk_) :: a1_exp
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real(psb_spk_), intent(in) :: x,y,z
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a1_exp=epsilon*exp(-(x+y+z))
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end function a1_exp
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function a2_exp(x,y,z)
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use psb_base_mod, only : psb_spk_
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real(psb_spk_) :: a2_exp
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real(psb_spk_), intent(in) :: x,y,z
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a2_exp=epsilon*exp(-(x+y+z))
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end function a2_exp
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function a3_exp(x,y,z)
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use psb_base_mod, only : psb_spk_
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real(psb_spk_) :: a3_exp
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real(psb_spk_), intent(in) :: x,y,z
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a3_exp=epsilon*exp(-(x+y+z))
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end function a3_exp
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function g_exp(x,y,z)
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use psb_base_mod, only : psb_spk_, sone, szero
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real(psb_spk_) :: g_exp
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real(psb_spk_), intent(in) :: x,y,z
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g_exp = szero
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if (x == sone) then
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g_exp = sone
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else if (x == szero) then
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g_exp = sone
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end if
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end function g_exp
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end module amg_s_pde3d_exp_mod
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