* F02GBF Example Program Text * Mark 16 Release. NAG Copyright 1992. * .. Parameters .. INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) INTEGER NMAX, LDA, LDV, LWORK PARAMETER (NMAX=8,LDA=NMAX,LDV=NMAX,LWORK=64*NMAX) * .. Local Scalars .. INTEGER I, IFAIL, J, N * .. Local Arrays .. COMPLEX *16 A(LDA,NMAX), V(LDV,NMAX), W(NMAX), WORK(LWORK) DOUBLE PRECISION RWORK(2*NMAX) CHARACTER CLABS(1), RLABS(1) * .. External Subroutines .. EXTERNAL F02GBF, X04DBF * .. Intrinsic Functions .. INTRINSIC AIMAG, DBLE * .. Executable Statements .. WRITE (NOUT,*) 'F02GBF Example Program Results' * Skip heading in data file READ (NIN,*) READ (NIN,*) N IF (N.LE.NMAX) THEN * * Read A from data file * READ (NIN,*) ((A(I,J),J=1,N),I=1,N) * * Compute eigenvalues and eigenvectors of A * IFAIL = 1 * CALL F02GBF('Vectors',N,A,LDA,W,V,LDV,RWORK,WORK,LWORK,IFAIL) * IF (IFAIL.EQ.0) THEN WRITE (NOUT,*) WRITE (NOUT,*) 'Eigenvalues' WRITE (NOUT,99999) (DBLE(W(I)),AIMAG(W(I)),I=1,N) WRITE (NOUT,*) * IFAIL = 0 CALL X04DBF('General',' ',N,N,V,LDV,'Bracketed','F7.4', + 'Eigenvectors','Integer',RLABS,'Integer',CLABS, + 80,0,IFAIL) ELSE WRITE (NOUT,99998) IFAIL END IF * END IF * 99999 FORMAT ((3X,4(' (',F7.4,',',F7.4,')',:))) 99998 FORMAT (1X,/1X,' ** F02GBF returned with IFAIL = ',I5) END