Program f01ekfe
! F01EKF Example Program Text
! Mark 30.2 Release. NAG Copyright 2024.
! .. Use Statements ..
Use nag_library, Only: f01ekf, nag_wp, x04caf
! .. Implicit None Statement ..
Implicit None
! .. Parameters ..
Integer, Parameter :: nin = 5, nout = 6
! .. Local Scalars ..
Real (Kind=nag_wp) :: imnorm
Integer :: i, ifail, lda, n
Character (4) :: fun
Character (20) :: fun_name
! .. Local Arrays ..
Real (Kind=nag_wp), Allocatable :: a(:,:)
! .. Executable Statements ..
Write (nout,*) 'F01EKF Example Program Results'
Write (nout,*)
Flush (nout)
! Skip heading in data file
Read (nin,*)
Read (nin,*) n, fun
lda = n
Allocate (a(lda,n))
! Read A from data file
Read (nin,*)(a(i,1:n),i=1,n)
! Find f( A )
ifail = 0
Call f01ekf(fun,n,a,lda,imnorm,ifail)
! Print solution
Write (fun_name,Fmt='(3(A))') 'F(A) = ', fun, '(A)'
Write (nout,*)
Flush (nout)
ifail = 0
Call x04caf('G','N',n,n,a,lda,fun_name,ifail)
! Print the norm of the imaginary part to check it is small
Write (nout,*)
Write (nout,Fmt='(1X,A,F6.2)') 'Imnorm =', imnorm
End Program f01ekfe