Program f01bsfe

!     F01BSF Example Program Text

!     Mark 27.3 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: f01brf, f01bsf, nag_wp, x04abf
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: iset = 1, nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: eta, rpmin, u
      Integer                          :: i, ifail, licn, lirn, n, nz, outchn
      Logical                          :: grow, lblock
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: a(:), w(:)
      Integer, Allocatable             :: icn(:), ikeep(:,:), irn(:),          &
                                          ivect(:), iw(:,:), jvect(:)
      Integer                          :: idisp(10)
      Logical                          :: abort(4)
!     .. Executable Statements ..
      Write (nout,*) 'F01BSF Example Program Results'
      outchn = nout
!     Skip heading in data file
      Read (nin,*)
      Read (nin,*) n, nz
      licn = 3*nz
      lirn = 3*nz/2
      Allocate (a(licn),w(n),icn(licn),ikeep(n,5),irn(lirn),ivect(nz),iw(n,8), &
        jvect(nz))
      Call x04abf(iset,outchn)
      Write (nout,*)
      Read (nin,*)(a(i),irn(i),icn(i),i=1,nz)
      u = 0.1E0_nag_wp
      lblock = .True.
      grow = .True.
      abort(1) = .True.
      abort(2) = .True.
      abort(3) = .False.
      abort(4) = .True.

!     ifail: behaviour on error exit
!             =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
      ifail = 0
      Call f01brf(n,nz,a,licn,irn,lirn,icn,u,ikeep,iw,w,lblock,grow,abort,     &
        idisp,ifail)

      If (grow) Then
        Write (nout,*) 'On exit from F01BRF'
        Write (nout,99999) 'Value of W(1)  = ', w(1)
      End If
      Read (nin,*)(a(i),ivect(i),jvect(i),i=1,nz)
      eta = 0.1E0_nag_wp

!     ifail: behaviour on error exit
!            =110 for noisy, hard exit
      ifail = 110
      Call f01bsf(n,nz,a,licn,ivect,jvect,icn,ikeep,iw,w,grow,eta,rpmin,       &
        abort(4),idisp,ifail)

      If (grow) Then
        Write (nout,*)
        Write (nout,*) 'On exit from F01BSF'
        Write (nout,99999) 'Value of W(1)  = ', w(1)
      End If
      If (eta<1.0E0_nag_wp) Then
        Write (nout,*)
        Write (nout,99999) 'Value of RPMIN = ', rpmin
      End If

99999 Format (1X,A,F7.4)
    End Program f01bsfe