* F02FCF Example Program Text * Mark 17 Release. NAG Copyright 1995. * .. Parameters .. INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) INTEGER NMAX, MMAX, LDA, LDZ, LWORK PARAMETER (NMAX=8,MMAX=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 .. DOUBLE PRECISION A(LDA,NMAX), W(NMAX), WORK(LWORK), Z(LDZ,MMAX) INTEGER IWORK(5*NMAX) * .. External Subroutines .. EXTERNAL F02FCF, X04CAF * .. Executable Statements .. WRITE (NOUT,*) 'F02FCF 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 = 0 * CALL F02FCF('Vectors','Index',UPLO,N,A,LDA,WL,WU,IL,IU,MMAX,M, + W,Z,LDZ,WORK,LWORK,IWORK,IFAIL) * WRITE (NOUT,*) WRITE (NOUT,*) 'Eigenvalues' WRITE (NOUT,99999) (W(I),I=1,M) WRITE (NOUT,*) * CALL X04CAF('General',' ',N,M,Z,LDZ,'Eigenvectors',IFAIL) * END IF STOP * 99999 FORMAT (3X,(8F8.4)) END