loc_function.f90

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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!! Time-stamp: <2016-10-18 15:24:16 pbrowne>
!!!
!!!    subroutine to compute a localisation weighting based on distance
!!!    Copyright (C) 2015 Philip A. Browne
!!!
!!!    This program is free software: you can redistribute it and/or modify
!!!    it under the terms of the GNU General Public License as published by
!!!    the Free Software Foundation, either version 3 of the License, or
!!!    (at your option) any later version.
!!!
!!!    This program is distributed in the hope that it will be useful,
!!!    but WITHOUT ANY WARRANTY; without even the implied warranty of
!!!    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
!!!    GNU General Public License for more details.
!!!
!!!    You should have received a copy of the GNU General Public License
!!!    along with this program.  If not, see <http://www.gnu.org/licenses/>.
!!!
!!!    Email: p.browne @ reading.ac.uk
!!!    Mail:  School of Mathematical and Physical Sciences,
!!!           University of Reading,
!!!       Reading, UK
!!!       RG6 6BB
!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


subroutine loc_function(loctype,dis,scal,inc)
  use output_empire, only : emp_e
  use pf_control
  implicit none
  integer, parameter :: rk = kind(1.0d0)
  integer, intent(in) :: loctype
  real(kind=rk), intent(in) :: dis
  real(kind=rk), intent(out) :: scal
  logical, intent(out) :: inc
  real(kind=rk), parameter :: minscal_gaussian = exp(-8.0d0)
  

  select case(loctype)
  case(1) ! exponential function
     scal = exp(-(dis**2)/(2.0_rk*pf%len**2))
     if(scal .gt. minscal_gaussian) then
        inc = .true.
     else
        inc = .false.
     end if
  case default
     write(emp_e,*) 'EMP: ERROR: loctype not supported in subroutine loc_funct&
          &ion'
     stop '-1'
  end select


end subroutine loc_function