Program f02wdfe

!     F02WDF Example Program Text

!     Mark 26.2 Release. NAG Copyright 2017.

!     .. Use Statements ..
      Use nag_library, Only: f02wdf, nag_wp, x04cbf
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: tol
      Integer                          :: i, ifail, irank, lda, ldpt, ldr,     &
                                          lwork, m, n
      Logical                          :: svd, wantb, wantpt, wantr
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: a(:,:), pt(:,:), r(:,:), sv(:),      &
                                          work(:), z(:)
      Character (1)                    :: clabs(1), rlabs(1)
!     .. Executable Statements ..
      Write (nout,*) 'F02WDF Example Program Results'
!     Skip heading in data file
      Read (nin,*)
      Read (nin,*) m, n
      Write (nout,*)
      lda = m
      ldpt = n
      ldr = n
      lwork = 3*n
      Allocate (a(lda,n),pt(ldpt,n),r(ldr,n),sv(n),work(lwork),z(n))
      svd = .True.
      tol = 5.0E-4_nag_wp
      Read (nin,*)(a(i,1:n),i=1,m)
      wantb = .False.
      wantr = .True.
      wantpt = .True.

!     ifail: behaviour on error exit
!             =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
      ifail = 0
      Call f02wdf(m,n,a,lda,wantb,work,tol,svd,irank,z,sv,wantr,r,ldr,wantpt,  &
        pt,ldpt,work,lwork,ifail)

      Write (nout,99999) 'Rank of A is', irank
      Write (nout,*)
      Flush (nout)

      ifail = 0
      Call x04cbf('General',' ',m,n,a,lda,'F9.3','Details of QU factorization' &
        ,'N',rlabs,'N',clabs,80,0,ifail)

      Write (nout,*)
      Write (nout,*) 'Vector Z'
      Write (nout,99998) z(1:n)
      Write (nout,*)
      Flush (nout)

      ifail = 0
      Call x04cbf('General',' ',n,n,r,ldr,'F9.3','Matrix R','N',rlabs,'N',     &
        clabs,80,0,ifail)

      Write (nout,*)
      Write (nout,*) 'Singular values'
      Write (nout,99998) sv(1:n)
      Write (nout,*)
      Flush (nout)

      ifail = 0
      Call x04cbf('General',' ',n,n,pt,ldpt,'F9.3','Matrix P**T','N',rlabs,    &
        'N',clabs,80,0,ifail)

99999 Format (1X,A,I5,A,I5)
99998 Format (1X,8F9.3)
    End Program f02wdfe