* F02HCF Example Program Text * Mark 17 Release. NAG Copyright 1995. * .. Parameters .. INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) INTEGER NMAX, MEST, LDA, LDZ, LWORK PARAMETER (NMAX=8,MEST=3,LDA=NMAX,LDZ=NMAX,LWORK=64*NMAX) * .. Local Scalars .. DOUBLE PRECISION WL, WU INTEGER I, IFAIL, IL, IU, J, M, N CHARACTER UPLO * .. Local Arrays .. COMPLEX *16 A(LDA,NMAX), WORK(LWORK), Z(LDZ,MEST) DOUBLE PRECISION RWORK(7*NMAX), W(NMAX) INTEGER IWORK(5*NMAX) CHARACTER CLABS(1), RLABS(1) * .. External Subroutines .. EXTERNAL F02HCF, X04DBF * .. Executable Statements .. WRITE (NOUT,*) 'F02HCF Example Program Results' * Skip heading in data file READ (NIN,*) READ (NIN,*) N, IL, IU IF (N.LE.NMAX) THEN * * Read A from data file * READ (NIN,*) UPLO IF (UPLO.EQ.'U') THEN READ (NIN,*) ((A(I,J),J=I,N),I=1,N) ELSE IF (UPLO.EQ.'L') THEN READ (NIN,*) ((A(I,J),J=1,I),I=1,N) END IF * * Compute selected eigenvalues and eigenvectors * IFAIL = 1 * CALL F02HCF('Vectors','Index',UPLO,N,A,LDA,WL,WU,IL,IU,MEST,M, + W,Z,LDZ,WORK,LWORK,RWORK,IWORK,IFAIL) * IF (IFAIL.EQ.0) THEN WRITE (NOUT,*) WRITE (NOUT,*) 'Eigenvalues' WRITE (NOUT,99999) (W(I),I=1,M) WRITE (NOUT,*) * IFAIL = 0 CALL X04DBF('General',' ',N,M,Z,LDZ,'Bracketed','F7.4', + 'Eigenvectors','Integer',RLABS,'Integer',CLABS, + 80,0,IFAIL) ELSE WRITE (NOUT,99998) IFAIL END IF * END IF * 99999 FORMAT (3X,4(F12.4,6X)) 99998 FORMAT (1X,/1X,' ** F02HCF returned with IFAIL = ',I5) END