PROGRAM nag_spline_1d_ex02

      ! Example Program Text for nag_spline_1d
      ! NAG fl90, Release 4. NAG Copyright 2000.

      ! .. Use Statements ..
      USE nag_examples_io, ONLY : nag_std_in, nag_std_out
      USE nag_spline_1d, ONLY : nag_spline_1d_comm_wp => nag_spline_1d_comm_dp &
       , nag_spline_1d_lsq_fit, nag_spline_1d_intg, nag_deallocate
      ! .. Implicit None Statement ..
      IMPLICIT NONE
      ! .. Intrinsic Functions ..
      INTRINSIC KIND
      ! .. Parameters ..
      INTEGER, PARAMETER :: wp = KIND(1.0D0)
      ! .. Local Scalars ..
      INTEGER :: m, p
      REAL (wp) :: integral, theta
      TYPE (nag_spline_1d_comm_wp) :: spline
      ! .. Local Arrays ..
      REAL (wp), ALLOCATABLE :: f(:), lambda(:), wt(:), x(:)
      ! .. Executable Statements ..
      WRITE (nag_std_out,*) 'Example Program Results for nag_spline_1d_ex02'

      READ (nag_std_in,*)          ! Skip heading in data file
      READ (nag_std_in,*) m, p

      ALLOCATE (x(m),f(m),wt(m),lambda(p-8)) ! Allocate storage

      READ (nag_std_in,*) x
      READ (nag_std_in,*) f
      READ (nag_std_in,*) wt
      READ (nag_std_in,*) lambda

      ! Fit spline and output residual norm.

      CALL nag_spline_1d_lsq_fit(x,f,lambda,spline,wt=wt,theta=theta)

      WRITE (nag_std_out,'(/1X,A,E12.4)') 'Residual sum of squares = ', theta

      ! Evaluate spline integral over region of definition.

      integral = nag_spline_1d_intg(spline)

      WRITE (nag_std_out,'(/1X,A,E12.4)') 'Spline integral = ', integral

      DEALLOCATE (x,f,wt,lambda)   ! Deallocate storage

      CALL nag_deallocate(spline)  ! Free structure allocated by NAG fl90

    END PROGRAM nag_spline_1d_ex02