Program g01arfe

!     G01ARF Example Program Text

!     Mark 27.3 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: g01arf, nag_wp, x04abf
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: iset = 1, nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: unit, unit1, unit2
      Integer                          :: i, ifail, ldplot, lines, n, nstepx,  &
                                          nstepy, outchn
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: sorty(:), y(:)
      Integer, Allocatable             :: iwork(:)
      Character (1), Allocatable       :: plot(:,:)
!     .. Intrinsic Procedures ..
      Intrinsic                        :: max
!     .. Executable Statements ..
      Write (nout,*) 'G01ARF Example Program Results'
      Write (nout,*)
      Flush (nout)

!     Skip heading in data file
      Read (nin,*)

!     Read in the problem size
      Read (nin,*) n, unit, nstepx, nstepy

!     Make sure there is more than the minimum number of lines available
!     for the plot
      ldplot = max(100,nstepy)

      Allocate (y(n),iwork(n),sorty(n),plot(ldplot,nstepx))

!     Read in data
      Read (nin,*) y(1:n)

!     Set advisory channel
      outchn = nout
      Call x04abf(iset,outchn)

!     Produce and display the plot
      unit1 = unit
      ifail = 0
      Call g01arf('Fences','Print',n,y,nstepx,nstepy,unit1,plot,ldplot,lines,  &
        sorty,iwork,ifail)

      Write (nout,*)
      Flush (nout)

!     Produce the plot, without printing it
      unit2 = unit
      ifail = 0
      Call g01arf('Extremes','Noprint',n,y,nstepx,nstepy,unit2,plot,ldplot,    &
        lines,sorty,iwork,ifail)

!     Display the plot
      Do i = 1, lines
        Write (nout,99999) plot(i,1:nstepx)
      End Do

99999 Format (1X,132A)
    End Program g01arfe