c     $Header:$

#include "cctk.h"
#include "cctk_Arguments.h"
#include "cctk_Functions.h"
#include "cctk_Parameters.h"
      
      subroutine IDScalarWaveMoL_InitialData (CCTK_ARGUMENTS)
      implicit none
      DECLARE_CCTK_ARGUMENTS
      DECLARE_CCTK_FUNCTIONS
      DECLARE_CCTK_PARAMETERS
      CCTK_REAL pi
      parameter (pi = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068d0)
      CCTK_REAL omega
      CCTK_REAL tmp
      integer i, j, k
      if (CCTK_EQUALS(initial_data, "plane wave")) then
         omega = sqrt(wave_number(1)**2 + wave_number(2)**2
     $        + wave_number(3)**2)
         do k=1,cctk_lsh(3)
            do j=1,cctk_lsh(2)
               do i=1,cctk_lsh(1)
                  tmp =  wave_number(1)*(x(i,j,k)-phase_offset(1))
     $                 + wave_number(2)*(y(i,j,k)-phase_offset(2))
     $                 + wave_number(3)*(z(i,j,k)-phase_offset(3))
     $                 + omega*(cctk_time-time_offset)
                  phi(i,j,k) = amplitude * cos (2*pi * tmp)
                  psi(i,j,k) = - amplitude * 2*pi * omega * sin (2*pi * tmp)
               end do
            end do
         end do
      else if (CCTK_EQUALS(initial_data, "Gaussian pulse")) then
         omega = sqrt(pulse_direction(1)**2 + pulse_direction(2)**2
     $        + pulse_direction(3)**2)
         do k=1,cctk_lsh(3)
            do j=1,cctk_lsh(2)
               do i=1,cctk_lsh(1)
                  tmp =  pulse_direction(1)*(x(i,j,k)-pulse_offset(1))
     $                 + pulse_direction(2)*(y(i,j,k)-pulse_offset(2))
     $                 + pulse_direction(3)*(z(i,j,k)-pulse_offset(3))
     $                 + omega*(cctk_time-time_offset)
                  phi(i,j,k) = amplitude * exp (-0.5d0 * tmp**2)
                  psi(i,j,k) = - tmp * omega * phi(i,j,k)
               end do
            end do
         end do
      end if
      end