Program f04jgfe

!     F04JGF Example Program Text

!     Mark 27.2 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: f04jgf, nag_wp
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: sigma, tol
      Integer                          :: i, ifail, irank, lda, lwork, m, n
      Logical                          :: svd
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: a(:,:), b(:), work(:)
!     .. Executable Statements ..
      Write (nout,*) 'F04JGF Example Program Results'
      Write (nout,*)
!     Skip heading in data file
      Read (nin,*)
      Read (nin,*) m, n
      tol = 5.0E-4_nag_wp
      lda = m
      lwork = 4*n
      Allocate (a(lda,n),b(m),work(lwork))
      Read (nin,*)(a(i,1:n),i=1,m)
      Read (nin,*) b(1:m)

!     ifail: behaviour on error exit
!             =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
      ifail = 0
      Call f04jgf(m,n,a,lda,b,tol,svd,sigma,irank,work,lwork,ifail)

      Write (nout,*) 'Solution vector'
      Write (nout,99997) b(1:n)
      Write (nout,*)
      Write (nout,99999) 'Standard error = ', sigma, '    Rank = ', irank
      Write (nout,*)
      Write (nout,99998) 'SVD = ', svd

99999 Format (1X,A,F6.3,A,I2)
99998 Format (1X,A,L2)
99997 Format (1X,8F9.3)
    End Program f04jgfe