Program f08jffe ! F08JFF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: dsterf, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: info, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: d(:), e(:) ! .. Executable Statements .. Write (nout,*) 'F08JFF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n Allocate (d(n),e(n-1)) ! Read T from data file Read (nin,*) d(1:n) Read (nin,*) e(1:n-1) ! Calculate the eigenvalues of T ! The NAG name equivalent of dsterf is f08jff Call dsterf(n,d,e,info) Write (nout,*) If (info>0) Then Write (nout,*) 'Failure to converge.' Else Write (nout,*) 'Eigenvalues' Write (nout,99999) d(1:n) End If 99999 Format (3X,(9F8.4)) End Program f08jffe