* F02FAF Example Program Text * Mark 16 Release. NAG Copyright 1992. * .. Parameters .. INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) INTEGER NMAX, LDA, LWORK PARAMETER (NMAX=8,LDA=NMAX,LWORK=64*NMAX) * .. Local Scalars .. INTEGER I, IFAIL, J, N CHARACTER UPLO * .. Local Arrays .. DOUBLE PRECISION A(LDA,NMAX), W(NMAX), WORK(LWORK) * .. External Subroutines .. EXTERNAL F02FAF, X04CAF * .. Executable Statements .. WRITE (NOUT,*) 'F02FAF 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,*) 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 eigenvalues and eigenvectors * IFAIL = 1 * CALL F02FAF('Vectors',UPLO,N,A,LDA,W,WORK,LWORK,IFAIL) * IF (IFAIL.EQ.0) THEN WRITE (NOUT,*) WRITE (NOUT,*) 'Eigenvalues' WRITE (NOUT,99999) (W(I),I=1,N) WRITE (NOUT,*) * IFAIL = 0 CALL X04CAF('General',' ',N,N,A,LDA,'Eigenvectors',IFAIL) ELSE WRITE (NOUT,99998) IFAIL END IF * END IF * 99999 FORMAT (3X,(8F8.4)) 99998 FORMAT (1X,/1X,' ** F02FAF returned with IFAIL = ',I5) END