Program f08kefe ! F08KEF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: dgebrd, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, info, lda, lwork, m, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:,:), d(:), e(:), taup(:), & tauq(:), work(:) ! .. Intrinsic Procedures .. Intrinsic :: min ! .. Executable Statements .. Write (nout,*) 'F08KEF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) m, n lda = m lwork = 64*(m+n) Allocate (a(lda,n),d(n),e(n-1),taup(n),tauq(n),work(lwork)) ! Read A from data file Read (nin,*)(a(i,1:n),i=1,m) ! Reduce A to bidiagonal form ! The NAG name equivalent of dgebrd is f08kef Call dgebrd(m,n,a,lda,d,e,tauq,taup,work,lwork,info) ! Print bidiagonal form Write (nout,*) Write (nout,*) 'Diagonal' Write (nout,99999) d(1:min(m,n)) If (m>=n) Then Write (nout,*) 'Super-diagonal' Else Write (nout,*) 'Sub-diagonal' End If Write (nout,99999) e(1:min(m,n)-1) 99999 Format (1X,8F9.4) End Program f08kefe