Program f08lsfe ! F08LSF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: nag_wp, zgbbrd ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 Character (1), Parameter :: vect = 'N' ! .. Local Scalars .. Integer :: i, info, j, kl, ku, ldab, ldc, ldpt, & ldq, m, n, ncc ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: ab(:,:), c(:,:), pt(:,:), q(:,:), & work(:) Real (Kind=nag_wp), Allocatable :: d(:), e(:), rwork(:) ! .. Intrinsic Procedures .. Intrinsic :: max, min ! .. Executable Statements .. Write (nout,*) 'F08LSF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) m, n, kl, ku, ncc ldab = kl + ku + 1 ldc = m ldpt = n ldq = m Allocate (ab(ldab,n),c(m,ncc),pt(ldpt,n),q(ldq,m),work(m+n),d(n),e(n-1), & rwork(m+n)) ! Read A from data file Read (nin,*)((ab(ku+1+i-j,j),j=max(i-kl,1),min(i+ku,n)),i=1,m) ! Reduce A to upper bidiagonal form ! The NAG name equivalent of zgbbrd is f08lsf Call zgbbrd(vect,m,n,ncc,kl,ku,ab,ldab,d,e,q,ldq,pt,ldpt,c,ldc,work, & rwork,info) ! Print bidiagonal form Write (nout,*) Write (nout,*) 'Diagonal' Write (nout,99999) d(1:min(m,n)) Write (nout,*) 'Super-diagonal' Write (nout,99999) e(1:min(m,n)-1) 99999 Format (1X,8F9.4) End Program f08lsfe