```    Program f11mefe

!     F11MEF Example Program Text

!     Mark 26.2 Release. NAG Copyright 2017.

!     .. Use Statements ..
Use nag_library, Only: f11mdf, f11mef, nag_wp, x04cbf
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Real (Kind=nag_wp), Parameter    :: one = 1.E0_nag_wp
Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
Real (Kind=nag_wp)               :: flop, thresh
Integer                          :: i, ifail, n, nnz, nnzl, nnzu, nzlmx, &
nzlumx, nzumx
Character (1)                    :: spec
!     .. Local Arrays ..
Real (Kind=nag_wp), Allocatable  :: a(:), lval(:), uval(:)
Integer, Allocatable             :: icolzp(:), il(:), iprm(:),           &
irowix(:), iu(:)
Character (1)                    :: clabs(1), rlabs(1)
!     .. Executable Statements ..
Write (nout,*) 'F11MEF Example Program Results'
Flush (nout)
!     Skip heading in data file

!     Read order of matrix

Allocate (icolzp(n+1),iprm(7*n))

!     Read the matrix A

nnz = icolzp(n+1) - 1

Allocate (a(nnz),lval(8*nnz),uval(8*nnz),il(7*n+8*nnz+4),irowix(nnz),    &
iu(2*n+8*nnz+1))

Do i = 1, nnz
Read (nin,*) a(i), irowix(i)
End Do

!     Calculate COLAMD permutation

spec = 'M'

!     ifail: behaviour on error exit
!             =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
ifail = 0
Call f11mdf(spec,n,icolzp,irowix,iprm,ifail)

!     Factorise

thresh = one
ifail = 0
nzlmx = 8*nnz
nzlumx = 8*nnz
nzumx = 8*nnz
Call f11mef(n,irowix,a,iprm,thresh,nzlmx,nzlumx,nzumx,il,lval,iu,uval,   &
nnzl,nnzu,flop,ifail)

!     Output results

Write (nout,99999)
Write (nout,99998) nnzl + nnzu - n
Flush (nout)

Call x04cbf('G','X',1,10,lval,1,'F7.2','Factor elements in LVAL','N',    &
rlabs,'N',clabs,80,0,ifail)
Call x04cbf('G','X',1,4,uval,1,'F7.2','Factor elements in UVAL','N',     &
rlabs,'N',clabs,80,0,ifail)

99999 Format (1X,/,1X,'Number of nonzeros in factors (excluding unit',         &
' diagonal)')
99998 Format (1X,I8)
End Program f11mefe
```