* F02ECF Example Program Text * Mark 17 Release. NAG Copyright 1995. * .. Parameters .. INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) INTEGER NMAX, MEST, LDA, LDV, LDVI, LDVR, LWORK PARAMETER (NMAX=8,MEST=3,LDA=NMAX,LDV=NMAX,LDVI=NMAX, + LDVR=NMAX,LWORK=64*NMAX) * .. Local Scalars .. DOUBLE PRECISION WL, WU INTEGER I, IFAIL, J, M, N * .. Local Arrays .. COMPLEX *16 V(LDV,NMAX) DOUBLE PRECISION A(LDA,NMAX), VI(LDVI,MEST), VR(LDVR,MEST), + WI(NMAX), WORK(LWORK), WR(NMAX) INTEGER IWORK(NMAX) LOGICAL BWORK(NMAX) CHARACTER CLABS(1), RLABS(1) * .. External Subroutines .. EXTERNAL F02ECF, X04DBF * .. Intrinsic Functions .. INTRINSIC CMPLX * .. Executable Statements .. WRITE (NOUT,*) 'F02ECF Example Program Results' * Skip heading in data file READ (NIN,*) READ (NIN,*) N, WL, WU IF (N.LE.NMAX) THEN * * Read A from data file * READ (NIN,*) ((A(I,J),J=1,N),I=1,N) * * Compute selected eigenvalues and eigenvectors of A * IFAIL = 1 * CALL F02ECF('Moduli',N,A,LDA,WL,WU,MEST,M,WR,WI,VR,LDVR,VI, + LDVI,WORK,LWORK,IWORK,BWORK,IFAIL) * IF (IFAIL.EQ.0) THEN WRITE (NOUT,*) WRITE (NOUT,*) 'Eigenvalues' WRITE (NOUT,99999) (' (',WR(I),',',WI(I),')',I=1,M) WRITE (NOUT,*) DO 40 J = 1, M DO 20 I = 1, N V(I,J) = CMPLX(VR(I,J),VI(I,J),KIND=KIND(WL)) 20 CONTINUE 40 CONTINUE * IFAIL = 0 CALL X04DBF('General',' ',N,M,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(A,F7.4,A,F7.4,A,:))) 99998 FORMAT (1X,/1X,' ** F02ECF returned with IFAIL = ',I5) END