Program g05tefe

!     G05TEF Example Program Text

!     Mark 30.1 Release. NAG Copyright 2024.

!     .. Use Statements ..
      Use nag_library, Only: g05kff, g05tef, nag_wp
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: lseed = 1, maxlr = 5000, nin = 5,    &
                                          nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: anp, tmp
      Integer                          :: genid, ifail, lr, lstate, m, mode,   &
                                          n, np, ns, subid
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: r(:)
      Integer                          :: seed(lseed)
      Integer, Allocatable             :: state(:), x(:)
!     .. Intrinsic Procedures ..
      Intrinsic                        :: int, real, sqrt
!     .. Executable Statements ..
      Write (nout,*) 'G05TEF Example Program Results'
      Write (nout,*)

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

!     Read in the base generator information and seed
      Read (nin,*) genid, subid, seed(1)

!     Initial call to initializer to get size of STATE array
      lstate = 0
      Allocate (state(lstate))
      ifail = 0
      Call g05kff(genid,subid,seed,lseed,state,lstate,ifail)

!     Reallocate STATE
      Deallocate (state)
      Allocate (state(lstate))

!     Initialize the generator to a repeatable sequence
      ifail = 0
      Call g05kff(genid,subid,seed,lseed,state,lstate,ifail)

!     Read in sample size
      Read (nin,*) n

!     Read in the distribution parameters
      Read (nin,*) ns, m, np

!     Use suggested value for LR
      anp = real(np,kind=nag_wp)
      tmp = (real(np-m,kind=nag_wp)/anp)*(real(np-ns,kind=nag_wp)/anp)*        &
        (real(m*ns,kind=nag_wp)/real(np,kind=nag_wp))
      lr = 28 + 20*int(sqrt(tmp))

!     If R is a reasonable size use MODE = 2
!     else do not reference R and use MODE = 3
      If (lr<maxlr) Then
        mode = 2
      Else
        mode = 3
        lr = 0
      End If

      Allocate (x(n),r(lr))

!     Generate the variates
      ifail = -1
      Call g05tef(mode,n,ns,np,m,r,lr,state,x,ifail)

!     Display the variates
      Write (nout,99999) x(1:n)

99999 Format (1X,I12)
    End Program g05tefe