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114 lines
3.4 KiB
Fortran
114 lines
3.4 KiB
Fortran
module psb_d_genpde_mod
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use psb_base_mod, only : psb_dpk_, psb_ipk_, psb_desc_type,&
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& psb_dspmat_type, psb_d_vect_type, dzero,&
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& psb_d_base_sparse_mat, psb_d_base_vect_type
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interface
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function d_func_3d(x,y,z) result(val)
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import :: psb_dpk_
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real(psb_dpk_), intent(in) :: x,y,z
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real(psb_dpk_) :: val
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end function d_func_3d
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end interface
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interface psb_gen_pde3d
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subroutine psb_d_gen_pde3d(ictxt,idim,a,bv,xv,desc_a,afmt, &
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& a1,a2,a3,b1,b2,b3,c,g,info,f,amold,vmold)
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!
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! Discretizes the partial differential equation
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!
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! a1 dd(u) a2 dd(u) a3 dd(u) b1 d(u) b2 d(u) b3 d(u)
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! - ------ - ------ - ------ + ----- + ------ + ------ + c u = f
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! dxdx dydy dzdz dx dy dz
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!
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! with Dirichlet boundary conditions
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! u = g
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!
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! on the unit cube 0<=x,y,z<=1.
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!
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!
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! Note that if b1=b2=b3=c=0., the PDE is the Laplace equation.
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!
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import :: psb_ipk_, psb_desc_type, psb_dspmat_type, psb_d_vect_type,&
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& d_func_3d, psb_d_base_sparse_mat, psb_d_base_vect_type
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implicit none
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procedure(d_func_3d) :: a1,a2,a3,c,b1,b2,b3,g
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integer(psb_ipk_) :: idim
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type(psb_dspmat_type) :: a
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type(psb_d_vect_type) :: xv,bv
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type(psb_desc_type) :: desc_a
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integer(psb_ipk_) :: ictxt, info
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character(len=*) :: afmt
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procedure(d_func_3d), optional :: f
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class(psb_d_base_sparse_mat), optional :: amold
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class(psb_d_base_vect_type), optional :: vmold
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end subroutine psb_d_gen_pde3d
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end interface
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interface
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function d_func_2d(x,y) result(val)
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import :: psb_dpk_
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real(psb_dpk_), intent(in) :: x,y
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real(psb_dpk_) :: val
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end function d_func_2d
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end interface
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interface psb_gen_pde2d
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subroutine psb_d_gen_pde2d(ictxt,idim,a,bv,xv,desc_a,afmt,&
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& a1,a2,b1,b2,c,g,info,f,amold,vmold)
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!
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! Discretizes the partial differential equation
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!
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! a1 dd(u) a2 dd(u) b1 d(u) b2 d(u)
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! - ------ - ------ + ----- + ------ + c u = f
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! dxdx dydy dx dy
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!
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! with Dirichlet boundary conditions
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! u = g
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!
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! on the unit square 0<=x,y<=1.
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!
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!
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! Note that if b1=b2=c=0., the PDE is the Laplace equation.
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!
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import :: psb_ipk_, psb_desc_type, psb_dspmat_type, psb_d_vect_type,&
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& d_func_2d, psb_d_base_sparse_mat, psb_d_base_vect_type
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implicit none
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procedure(d_func_2d) :: a1,a2,c,b1,b2,g
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integer(psb_ipk_) :: idim
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type(psb_dspmat_type) :: a
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type(psb_d_vect_type) :: xv,bv
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type(psb_desc_type) :: desc_a
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integer(psb_ipk_) :: ictxt, info
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character(len=*) :: afmt
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procedure(d_func_2d), optional :: f
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class(psb_d_base_sparse_mat), optional :: amold
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class(psb_d_base_vect_type), optional :: vmold
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end subroutine psb_d_gen_pde2d
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end interface
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contains
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function d_null_func_3d(x,y,z) result(val)
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real(psb_dpk_), intent(in) :: x,y,z
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real(psb_dpk_) :: val
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val = dzero
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end function d_null_func_3d
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function d_null_func_2d(x,y) result(val)
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real(psb_dpk_), intent(in) :: x,y
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real(psb_dpk_) :: val
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val = dzero
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end function d_null_func_2d
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end module psb_d_genpde_mod
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