PROGRAM f02ecfe ! F02ECF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : f02ecf, 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, j, lda, ldv, ldvi, ldvr, & lwork, m, mest, n ! .. Local Arrays .. COMPLEX (KIND=nag_wp), ALLOCATABLE :: v(:,:) REAL (KIND=nag_wp), ALLOCATABLE :: a(:,:), vi(:,:), vr(:,:), wi(:), & work(:), wr(:) INTEGER, ALLOCATABLE :: iwork(:) LOGICAL, ALLOCATABLE :: bwork(:) CHARACTER (1) :: clabs(1), rlabs(1) ! .. Intrinsic Functions .. INTRINSIC cmplx ! .. Executable Statements .. WRITE (nout,*) 'F02ECF Example Program Results' ! Skip heading in data file READ (nin,*) READ (nin,*) n, mest, wl, wu lda = n ldv = n ldvi = n ldvr = n lwork = 64*n ALLOCATE (v(ldv,n),a(lda,n),vi(ldvi,mest),vr(ldvr,mest),wi(n), & work(lwork),wr(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 f02ecf('Moduli',n,a,lda,wl,wu,mest,m,wr,wi,vr,ldvr,vi,ldvi,work, & lwork,iwork,bwork,ifail) WRITE (nout,*) WRITE (nout,*) 'Eigenvalues' WRITE (nout,99999) (' (',wr(i),',',wi(i),')',i=1,m) WRITE (nout,*) FLUSH (nout) DO j = 1, m DO i = 1, n v(i,j) = cmplx(vr(i,j),vi(i,j),kind=nag_wp) END DO END DO ifail = 0 CALL x04dbf('General',' ',n,m,v,ldv,'Bracketed','F7.4','Eigenvectors', & 'Integer',rlabs,'Integer',clabs,80,0,ifail) 99999 FORMAT ((3X,4(A,F7.4,A,F7.4,A:))) END PROGRAM f02ecfe