NAG Library Manual, Mark 28.6
Interfaces:  FL   CL   CPP   AD
```    Program f07wrfe

!     F07WRF Example Program Text

!     Mark 28.6 Release. NAG Copyright 2022.

!     .. Use Statements ..
Use nag_library, Only: nag_wp, x04dbf, zpftrf, ztfttr
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
Integer                          :: i, ifail, info, k, lar1, lda, lenar, &
n, q
Character (1)                    :: transr, uplo
!     .. Local Arrays ..
Complex (Kind=nag_wp), Allocatable :: a(:,:), ar(:)
Character (1)                    :: clabs(1), rlabs(1)
!     .. Executable Statements ..
Write (nout,*) 'F07WRF Example Program Results'
!     Skip heading in data file
Read (nin,*) n, uplo, transr

lenar = n*(n+1)/2
lda = n
Allocate (ar(lenar),a(lda,n))

!     Setup notional dimensions of RFP matrix AR
k = n/2
q = n - k
If (transr=='N' .Or. transr=='n') Then
lar1 = 2*k + 1
Else
lar1 = q
End If

!     Read an RFP matrix into array AR
Do i = 1, lar1
End Do

!     Factorize A
!     The NAG name equivalent of zpftrf is f07wrf
Call zpftrf(transr,uplo,n,ar,info)

Write (nout,*)
Flush (nout)
If (info==0) Then

!       Convert and print factor
!       The NAG name equivalent of ztfttr is f01vhf
Call ztfttr(transr,uplo,n,ar,a,lda,info)
ifail = 0
Call x04dbf(uplo,'Nonunit',n,n,a,lda,'Bracketed','F7.4','Factor',      &
'Integer',rlabs,'Integer',clabs,80,0,ifail)

Else
Write (nout,*) 'A is not positive definite'
End If

End Program f07wrfe
```