program main !*****************************************************************************80 ! !! chebyshev_interp_1d_test() tests chebyshev_interp_1d(). ! ! Licensing: ! ! This code is distributed under the MIT license. ! ! Modified: ! ! 28 September 2012 ! ! Author: ! ! John Burkardt ! implicit none integer prob integer prob_num call timestamp ( ) write ( *, '(a)' ) '' write ( *, '(a)' ) 'CHEBYSHEV_INTERP_1D_TEST():' write ( *, '(a)' ) ' Fortran90 version' write ( *, '(a)' ) ' Test CHEBYSHEV_INTERP_1D().' write ( *, '(a)' ) ' The QR_SOLVE and R8LIB libraries are needed.' write ( *, '(a)' ) ' The test needs the TEST_INTERP library as well.' call p00_prob_num ( prob_num ) do prob = 1, prob_num call test01 ( prob ) end do ! ! Terminate. ! write ( *, '(a)' ) '' write ( *, '(a)' ) 'CHEBYSHEV_INTERP_1D_TEST:' write ( *, '(a)' ) ' Normal end of execution.' write ( *, '(a)' ) '' call timestamp ( ) stop 0 end subroutine test01 ( prob ) !*****************************************************************************80 ! !! TEST01 tests CHEBYSHEV_VALUE_1D. ! ! Licensing: ! ! This code is distributed under the MIT license. ! ! Modified: ! ! 17 September 2012 ! ! Author: ! ! John Burkardt ! implicit none integer, parameter :: rk = kind ( 1.0D+00 ) real ( kind = rk ) int_error integer nd integer ni integer prob real ( kind = rk ) r8vec_norm_affine real ( kind = rk ), allocatable :: xd(:) real ( kind = rk ), allocatable :: xi(:) real ( kind = rk ), allocatable :: xy(:,:) real ( kind = rk ), allocatable :: yd(:) real ( kind = rk ), allocatable :: yi(:) write ( *, '(a)' ) '' write ( *, '(a)' ) 'CHEBYSHEV_INTERP_1D_TEST01:' write ( *, '(a,i6)' ) ' Interpolate data from TEST_INTERP problem #', prob call p00_data_num ( prob, nd ) write ( *, '(a,i6)' ) ' Number of data points = ', nd allocate ( xy(1:2,1:nd) ) call p00_data ( prob, 2, nd, xy ) call r8mat_transpose_print ( 2, nd, xy, ' Data array:' ) allocate ( xd(1:nd) ) allocate ( yd(1:nd) ) xd(1:nd) = xy(1,1:nd) yd(1:nd) = xy(2,1:nd) ! ! #1: Does interpolant match function at interpolation points? ! ni = nd allocate ( xi(1:ni) ) allocate ( yi(1:ni) ) xi(1:ni) = xd(1:nd) call chebyshev_interp_1d ( nd, xd, yd, ni, xi, yi ) int_error = r8vec_norm_affine ( ni, yi, yd ) / real ( ni, kind = rk ) write ( *, '(a)' ) '' write ( *, '(a,g14.6)' ) & ' L2 interpolation error averaged per interpolant node = ', int_error deallocate ( xd ) deallocate ( xi ) deallocate ( xy ) deallocate ( yd ) deallocate ( yi ) return end subroutine timestamp ( ) !*****************************************************************************80 ! !! timestamp() prints the current YMDHMS date as a time stamp. ! ! Example: ! ! 31 May 2001 9:45:54.872 AM ! ! Licensing: ! ! This code is distributed under the MIT license. ! ! Modified: ! ! 15 August 2021 ! ! Author: ! ! John Burkardt ! implicit none character ( len = 8 ) ampm integer d integer h integer m integer mm character ( len = 9 ), parameter, dimension(12) :: month = (/ & 'January ', 'February ', 'March ', 'April ', & 'May ', 'June ', 'July ', 'August ', & 'September', 'October ', 'November ', 'December ' /) integer n integer s integer values(8) integer y call date_and_time ( values = values ) y = values(1) m = values(2) d = values(3) h = values(5) n = values(6) s = values(7) mm = values(8) if ( h < 12 ) then ampm = 'AM' else if ( h == 12 ) then if ( n == 0 .and. s == 0 ) then ampm = 'Noon' else ampm = 'PM' end if else h = h - 12 if ( h < 12 ) then ampm = 'PM' else if ( h == 12 ) then if ( n == 0 .and. s == 0 ) then ampm = 'Midnight' else ampm = 'AM' end if end if end if write ( *, '(i2.2,1x,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