Program f02gcfe ! F02GCF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: f02gcf, nag_wp, x04dbf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Real (Kind=nag_wp) :: wl, wu Integer :: i, ifail, lda, ldv, lwork, m, mest, n ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:,:), v(:,:), w(:), work(:) Real (Kind=nag_wp), Allocatable :: rwork(:) Integer, Allocatable :: iwork(:) Logical, Allocatable :: bwork(:) Character (1) :: clabs(1), rlabs(1) ! .. Executable Statements .. Write (nout,*) 'F02GCF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n, mest, wl, wu lda = n ldv = n lwork = 64*n Allocate (a(lda,n),v(ldv,n),w(n),work(lwork),rwork(2*n),iwork(n), & bwork(n)) ! Read A from data file Read (nin,*)(a(i,1:n),i=1,n) ! Compute selected eigenvalues and eigenvectors of A ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call f02gcf('Moduli',n,a,lda,wl,wu,mest,m,w,v,ldv,work,lwork,rwork, & iwork,bwork,ifail) Write (nout,*) Write (nout,*) 'Eigenvalues' Write (nout,99999) w(1:m) Write (nout,*) Flush (nout) ifail = 0 Call x04dbf('General',' ',n,m,v,ldv,'Bracketed','F7.4','Eigenvectors', & 'Integer',rlabs,'Integer',clabs,80,0,ifail) 99999 Format ((3X,4(' (',F7.4,',',F7.4,')':))) End Program f02gcfe