program main

c*********************************************************************72
c
cc TEST_INTERP_2D_PRB tests the TEST_INTERP_2D library.
c
c  Licensing:
c
c    This code is distributed under the MIT license. 
c
c  Modified:
c
c    05 October 2012
c
c  Author:
c
c    John Burkardt
c
      implicit none

      call timestamp ( )
      write ( *, '(a)' ) ' '
      write ( *, '(a)' ) 'TEST_INTERP_2D_PRB'
      write ( *, '(a)' ) '  FORTRAN77 version'
      write ( *, '(a)' ) '  Test the TEST_INTERP_2D library.'
      write ( *, '(a)' ) 
     &  '  The test requires access to the R8LIB library.'

      call test01 ( )
      call test02 ( )
c
c  Terminate.
c
      write ( *, '(a)' ) ' '
      write ( *, '(a)' ) 'TEST_INTERP_2D_PRB'
      write ( *, '(a)' ) '  Normal end of execution.'
      write ( *, '(a)' ) ' '
      call timestamp ( )

      stop
      end
      subroutine test01 ( )

c*********************************************************************72
c
cc TEST01 simply prints the title of each grid and function.
c
c  Licensing:
c
c    This code is distributed under the MIT license. 
c
c  Modified:
c
c    28 January 2012
c
c  Author:
c
c    John Burkardt
c
      implicit none

      integer f_num
      integer fi
      character ( len = 50 ) ft
      integer g_num
      integer gi
      character ( len = 50 ) gt

      write ( *, '(a)' ) ' '
      write ( *, '(a)' ) 'TEST01'
      write ( *, '(a)' ) 
     &  '  For each grid and function, print the title.'

      call g00_num ( g_num )

      write ( *, '(a)' ) ' '
      write ( *, '(a)' ) '  GRIDS:'
      write ( *, '(a)' ) '  Index  Title'
      write ( *, '(a)' ) ' '

      do gi = 1, g_num

        call g00_title ( gi, gt )

        write ( *, '(2x,i2,2x,a)' ) gi, gt

      end do

      call f00_num ( f_num )

      write ( *, '(a)' ) ' '
      write ( *, '(a)' ) '  FUNCTIONS:'
      write ( *, '(a)' ) '  Index  Title'
      write ( *, '(a)' ) ' '

      do fi = 1, f_num

        call f00_title ( fi, ft )

        write ( *, '(2x,i2,2x,a)' ) fi, ft

      end do

      return
      end
      subroutine test02 ( )

c*********************************************************************72
c
cc TEST02 samples each function using each grid.
c
c  Licensing:
c
c    This code is distributed under the MIT license. 
c
c  Modified:
c
c    28 January 2012
c
c  Author:
c
c    John Burkardt
c
      implicit none

      double precision f(100)
      double precision f_ave
      double precision f_max
      double precision f_min
      integer f_num
      integer fi
      character * ( 50 ) ft
      integer g_num
      integer gi
      integer gn
      character * ( 50 ) gt
      double precision gx(100)
      double precision gy(100)
      double precision r8vec_max
      double precision r8vec_min
      double precision r8vec_sum

      write ( *, '(a)' ) ' '
      write ( *, '(a)' ) 'TEST02'
      write ( *, '(a)' ) '  Sample each function over each grid.'

      call g00_num ( g_num )
      call f00_num ( f_num )

      do fi = 1, f_num

        call f00_title ( fi, ft )
        write ( *, '(a)' ) ' '
        write ( *, '(2x,i2,2x,a)' ) fi, trim ( ft )
        write ( *, '(a)' ) '        Grid Title                     ' //
     &    'Min(F)          Ave(F)           Max(F)'
        write ( *, '(a)' ) ' '

        do gi = 1, g_num

          call g00_title ( gi, gt )
          call g00_size ( gi, gn )

          call g00_xy ( gi, gn, gx, gy )

          call f00_f0 ( fi, gn, gx, gy, f )

          f_max = r8vec_max ( gn, f )
          f_min = r8vec_min ( gn, f )
          f_ave = r8vec_sum ( gn, f )
          f_ave = f_ave / dble ( gn )

          write ( *, '(2x,i4,2x,a25,2x,g14.6,2x,g14.6,2x,g14.6)' ) 
     &      gi, gt, f_min, f_ave, f_max

        end do

      end do

      return
      end
      function r8vec_max ( n, a )

c*********************************************************************72
c
cc r8vec_max() returns the maximum value in an R8VEC.
c
c  Discussion:
c
c    An R8VEC is a vector of R8's.
c
c  Licensing:
c
c    This code is distributed under the MIT license.
c
c  Modified:
c
c    12 May 2014
c
c  Author:
c
c    John Burkardt
c
c  Parameters:
c
c    Input, integer N, the number of entries in the array.
c
c    Input, double precision A(N), the array.
c
c    Output, double precision R8VEC_MAX, the value of the largest entry.
c
      implicit none

      integer n

      double precision a(n)
      integer i
      double precision r8_huge
      parameter ( r8_huge = 1.79769313486231571D+308 )
      double precision r8vec_max
      double precision value

      value = - r8_huge
      do i = 1, n
        value = max ( value, a(i) )
      end do

      r8vec_max = value

      return
      end
      function r8vec_min ( n, a )

c*********************************************************************72
c
cc r8vec_min() returns the minimum value in an R8VEC.
c
c  Discussion:
c
c    An R8VEC is a vector of R8's.
c
c  Licensing:
c
c    This code is distributed under the MIT license.
c
c  Modified:
c
c    18 January 2015
c
c  Author:
c
c    John Burkardt
c
c  Parameters:
c
c    Input, integer N, the number of entries in the array.
c
c    Input, double precision A(N), the array.
c
c    Output, double precision R8VEC_MIN, the value of the smallest entry.
c
      implicit none

      integer n

      double precision a(n)
      integer i
      double precision r8_huge
      parameter ( r8_huge = 1.79769313486231571D+308 )
      double precision r8vec_min
      double precision value

      value = r8_huge
      do i = 1, n
        value = min ( value, a(i) )
      end do

      r8vec_min = value

      return
      end
      function r8vec_sum ( n, v1 )

c*********************************************************************72
c
cc r8vec_sum() sums the entries of an R8VEC.
c
c  Discussion:
c
c    An R8VEC is a vector of R8's.
c
c    In FORTRAN90, the system routine SUM should be called
c    directly.
c
c  Licensing:
c
c    This code is distributed under the MIT license.
c
c  Modified:
c
c    22 July 2008
c
c  Author:
c
c    John Burkardt
c
c  Parameters:
c
c    Input, integer N, the dimension of the vectors.
c
c    Input, double precision V1(N), the vector.
c
c    Output, double precision R8VEC_SUM, the sum of the entries.
c
      implicit none

      integer n

      integer i
      double precision r8vec_sum
      double precision v1(n)
      double precision value

      value = 0.0D+00
      do i = 1, n
        value = value + v1(i)
      end do

      r8vec_sum = value

      return
      end
      subroutine timestamp ( )

c*********************************************************************72
c
cc timestamp() prints the YMDHMS date as a timestamp.
c
c  Licensing:
c
c    This code is distributed under the MIT license.
c
c  Modified:
c
c    12 June 2014
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, trim ( month(m) ), y, h, ':', n, ':', s, '.', mm, 
     &  trim ( ampm )

      return
      end