NAG Library Manual, Mark 28.7
```    Program f07nwfe

!     F07NWF Example Program Text

!     Mark 28.7 Release. NAG Copyright 2022.

!     .. Use Statements ..
Use nag_library, Only: nag_wp, x04dbf, zsytrf, zsytri
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
Integer                          :: i, ifail, info, lda, lwork, n
Character (1)                    :: uplo
!     .. Local Arrays ..
Complex (Kind=nag_wp), Allocatable :: a(:,:), work(:)
Integer, Allocatable             :: ipiv(:)
Character (1)                    :: clabs(1), rlabs(1)
!     .. Executable Statements ..
Write (nout,*) 'F07NWF Example Program Results'
!     Skip heading in data file
lda = n
lwork = 64*n
Allocate (a(lda,n),work(lwork),ipiv(n))

!     Read A from data file

If (uplo=='U') Then
Else If (uplo=='L') Then
End If

!     Factorize A
!     The NAG name equivalent of zsytrf is f07nrf
Call zsytrf(uplo,n,a,lda,ipiv,work,lwork,info)

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

!       Compute inverse of A
!       The NAG name equivalent of zsytri is f07nwf
Call zsytri(uplo,n,a,lda,ipiv,work,info)

!       Print inverse

!       ifail: behaviour on error exit
!              =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
ifail = 0
Call x04dbf(uplo,'Nonunit',n,n,a,lda,'Bracketed','F7.4','Inverse',     &
'Integer',rlabs,'Integer',clabs,80,0,ifail)

Else
Write (nout,*) 'The factor D is singular'
End If

End Program f07nwfe
```