program main

c*********************************************************************72
c
cc closest_point_brute_test() tests closest_point_brute().
c
c  Discussion:
c
c    We are given R, a set of NR points in M dimensions.
c
c    We are given S, a points in M dimensions.
c
c    We seek the index J of the point R(J)
c    which is nearest to S over all points in R.
c
c  Licensing:
c
c    This code is distributed under the MIT license.
c
c  Modified:
c
c    15 August 2024
c
c  Author:
c
c    John Burkardt
c
c  Local:
c
c    integer M, the spatial dimension.
c
c    integer NR, the number of data points.
c
c    double precision R(M,NR), the data points.
c
c    double precision RT(NR,M), the transposed data points.
c
c    double precision S(M), the sample point. 
c
      implicit none

      integer m
      double precision near_dist
      integer near_index
      integer nr
      double precision, allocatable :: r(:,:)
      double precision, allocatable :: s(:)
      double precision t1
      double precision t2

      call timestamp ( )
      write ( *, '(a)' ) ''
      write ( *, '(a)' ) 'closest_point_brute_test():'
      write ( *, '(a)' ) '  Fortran77 version'
      write ( *, '(a)' ) '  Test closest_point_brute().'

      m = 2
      write ( *, '(a,i2)' ) '  Spatial dimension m = ', m
      write ( *, '(a)' ) ''

      nr = 1

      do while ( nr <= 65536 )

        allocate ( r(1:nr,1:m) )
        call random_number ( harvest = r )
 
        allocate ( s(1:m) )
        call random_number ( harvest = s )

        call cpu_time ( t1 )
        call closest_point_brute ( m, nr, r, s, near_index, near_dist )
        call cpu_time ( t2 )

        write ( *, '(i5,2x,i5,2x,g8.2,2x,g8.2)' )
     &    nr, near_index, near_dist, ( t2 - t1 )

        deallocate ( r )
        deallocate ( s )

        nr = nr * 2

      end do
c
c  Terminate.
c
      write ( *, '(a)' ) ''
      write ( *, '(a)' ) 'closest_point_brute_test():'
      write ( *, '(a)' ) '  Normal end of execution.'
      write ( *, '(a)' ) ''
      call timestamp ( )

      return
      end
      subroutine timestamp ( )

c*********************************************************************72
c
cc timestamp() prints out the current YMDHMS date as a timestamp.
c
c  Licensing:
c
c    This code is distributed under the MIT license.
c
c  Modified:
c
c    12 January 2007
c
c  Author:
c
c    John Burkardt
c
      implicit none

      character * ( 8 ) ampm
      integer d
      character * ( 8 ) date
      integer h
      integer m
      integer mm
      character * ( 9 ) month(12)
      integer n
      integer s
      character * ( 10 ) time
      integer y

      save month

      data month /
     &  'January  ', 'February ', 'March    ', 'April    ',
     &  'May      ', 'June     ', 'July     ', 'August   ',
     &  'September', 'October  ', 'November ', 'December ' /

      call date_and_time ( date, time )

      read ( date, '(i4,i2,i2)' ) y, m, d
      read ( time, '(i2,i2,i2,1x,i3)' ) h, n, s, mm

      if ( h .lt. 12 ) then
        ampm = 'AM'
      else if ( h .eq. 12 ) then
        if ( n .eq. 0 .and. s .eq. 0 ) then
          ampm = 'Noon'
        else
          ampm = 'PM'
        end if
      else
        h = h - 12
        if ( h .lt. 12 ) then
          ampm = 'PM'
        else if ( h .eq. 12 ) then
          if ( n .eq. 0 .and. s .eq. 0 ) then
            ampm = 'Midnight'
          else
            ampm = 'AM'
          end if
        end if
      end if

      write ( *,
     &  '(i2,1x,a,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' )
     &  d, month(m), y, h, ':', n, ':', s, '.', mm, ampm

      return
      end