Program g01sffe
!     G01SFF Example Program Text

!     Mark 27.3 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: g01sff, nag_wp
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
      Integer                          :: i, ifail, la, lb, lg, lout, ltail
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: a(:), b(:), g(:), p(:)
      Integer, Allocatable             :: ivalid(:)
      Character (1), Allocatable       :: tail(:)
!     .. Intrinsic Procedures ..
      Intrinsic                        :: max, mod, repeat
!     .. Executable Statements ..
      Write (nout,*) 'G01SFF Example Program Results'
      Write (nout,*)
!     Skip heading in data file
      Read (nin,*)

!     Read in the input vectors
      Read (nin,*) ltail
      Allocate (tail(ltail))
      Read (nin,*) tail(1:ltail)

      Read (nin,*) lg
      Allocate (g(lg))
      Read (nin,*) g(1:lg)

      Read (nin,*) la
      Allocate (a(la))
      Read (nin,*) a(1:la)

      Read (nin,*) lb
      Allocate (b(lb))
      Read (nin,*) b(1:lb)

!     Allocate memory for output
      lout = max(ltail,lg,la,lb)
      Allocate (p(lout),ivalid(lout))

!     Calculate probability
      ifail = -1
      Call g01sff(ltail,tail,lg,g,la,a,lb,b,p,ivalid,ifail)

      If (ifail==0 .Or. ifail==1) Then
!       Display titles
        Write (nout,*)                                                         &
          '  TAIL      G         A         B         P     IVALID'
        Write (nout,*) repeat('-',57)

!       Display results
        Do i = 1, lout
          Write (nout,99999) tail(mod(i-1,ltail)+1), g(mod(i-1,lg)+1),         &
            a(mod(i-1,la)+1), b(mod(i-1,lb)+1), p(i), ivalid(i)
        End Do
      End If

99999 Format (5X,A1,3(4X,F6.2),4X,F6.3,4X,I3)
    End Program g01sffe