* F02EAF Example Program Text * Mark 16 Release. NAG Copyright 1992. * .. Parameters .. INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) INTEGER NMAX, LDA, LDZ, LWORK PARAMETER (NMAX=8,LDA=NMAX,LDZ=NMAX,LWORK=64*NMAX) * .. Local Scalars .. INTEGER I, IFAIL, J, N * .. Local Arrays .. DOUBLE PRECISION A(LDA,NMAX), WI(NMAX), WORK(LWORK), WR(NMAX), + Z(LDZ,NMAX) * .. External Subroutines .. EXTERNAL F02EAF, X04CAF * .. Executable Statements .. WRITE (NOUT,*) 'F02EAF 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 Schur factorization of A * IFAIL = 1 * CALL F02EAF('Vectors',N,A,LDA,WR,WI,Z,LDZ,WORK,LWORK,IFAIL) * IF (IFAIL.EQ.0) THEN WRITE (NOUT,*) WRITE (NOUT,*) 'Eigenvalues' WRITE (NOUT,99999) (' (',WR(I),',',WI(I),')',I=1,N) WRITE (NOUT,*) * IFAIL = 0 CALL X04CAF('General',' ',N,N,A,LDA,'Schur form',IFAIL) * WRITE (NOUT,*) * IFAIL = 0 CALL X04CAF('General',' ',N,N,Z,LDZ,'Schur vectors',IFAIL) ELSE WRITE (NOUT,99998) IFAIL END IF * END IF * 99999 FORMAT (1X,A,F8.4,A,F8.4,A) 99998 FORMAT (1X,/1X,' ** F02EAF returned with IFAIL = ',I5) END