PROGRAM f02gcfe ! F02GCF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. 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