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amg4psblas/samples/advanced/pdegen/amg_d_pde2d_box_mod.f90

90 lines
3.3 KiB
Fortran

!
!
! 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
!
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions
! are met:
! 1. Redistributions of source code must retain the above copyright
! notice, this list of conditions and the following disclaimer.
! 2. Redistributions in binary form must reproduce the above copyright
! notice, this list of conditions, and the following disclaimer in the
! documentation and/or other materials provided with the distribution.
! 3. The name of the AMG4PSBLAS group or the names of its contributors may
! not be used to endorse or promote products derived from this
! software without specific written permission.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! POSSIBILITY OF SUCH DAMAGE.
!
module amg_d_pde2d_box_mod
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_), save, private :: epsilon=done/80
contains
subroutine pde_set_parm(dat)
real(psb_dpk_), intent(in) :: dat
epsilon = dat
end subroutine pde_set_parm
!
! functions parametrizing the differential equation
!
function b1_box(x,y)
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_) :: b1_box
real(psb_dpk_), intent(in) :: x,y
b1_box = done/1.414_psb_dpk_
end function b1_box
function b2_box(x,y)
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_) :: b2_box
real(psb_dpk_), intent(in) :: x,y
b2_box = done/1.414_psb_dpk_
end function b2_box
function c_box(x,y)
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_) :: c_box
real(psb_dpk_), intent(in) :: x,y
c_box = dzero
end function c_box
function a1_box(x,y)
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_) :: a1_box
real(psb_dpk_), intent(in) :: x,y
a1_box=done*epsilon
end function a1_box
function a2_box(x,y)
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_) :: a2_box
real(psb_dpk_), intent(in) :: x,y
a2_box=done*epsilon
end function a2_box
function g_box(x,y)
use psb_base_mod, only : psb_dpk_, dzero, done
real(psb_dpk_) :: g_box
real(psb_dpk_), intent(in) :: x,y
g_box = dzero
if (x == done) then
g_box = done
else if (x == dzero) then
g_box = done
end if
end function g_box
end module amg_d_pde2d_box_mod