Program f07uwfe
! F07UWF Example Program Text
! Mark 28.7 Release. NAG Copyright 2022.
! .. Use Statements ..
Use nag_library, Only: nag_wp, x04ddf, ztptri
! .. Implicit None Statement ..
Implicit None
! .. Parameters ..
Integer, Parameter :: nin = 5, nout = 6
Character (1), Parameter :: diag = 'N'
! .. Local Scalars ..
Integer :: i, ifail, info, j, n
Character (1) :: uplo
! .. Local Arrays ..
Complex (Kind=nag_wp), Allocatable :: ap(:)
Character (1) :: clabs(1), rlabs(1)
! .. Executable Statements ..
Write (nout,*) 'F07UWF Example Program Results'
! Skip heading in data file
Read (nin,*)
Read (nin,*) n
Allocate (ap(n*(n+1)/2))
! Read A from data file
Read (nin,*) uplo
If (uplo=='U') Then
Read (nin,*)((ap(i+j*(j-1)/2),j=i,n),i=1,n)
Else If (uplo=='L') Then
Read (nin,*)((ap(i+(2*n-j)*(j-1)/2),j=1,i),i=1,n)
End If
! Compute inverse of A
! The NAG name equivalent of ztptri is f07uwf
Call ztptri(uplo,diag,n,ap,info)
! Print inverse
Write (nout,*)
Flush (nout)
! ifail: behaviour on error exit
! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
ifail = 0
Call x04ddf(uplo,diag,n,ap,'Bracketed','F7.4','Inverse','Integer',rlabs, &
'Integer',clabs,80,0,ifail)
End Program f07uwfe