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PROGRAM TEST
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IMPLICIT NONE
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C
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DOUBLE PRECISION ZERO
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INTEGER LDEVAL, LDEVEC, LDIWRK, LDWORK, LDWRK2
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INTEGER LENGTA, N
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PARAMETER (N = 3)
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PARAMETER (LDEVAL = N)
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PARAMETER (LDEVEC = N)
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PARAMETER (LDIWRK = 5 * N)
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PARAMETER (LDWORK = 2 * N)
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PARAMETER (LDWRK2 = 7 * N)
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PARAMETER (LENGTA = (N * N + N) / 2)
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PARAMETER (ZERO = 0.0D0)
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C
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DOUBLE PRECISION EVALS(LDEVAL), TEMP, WORK2(LDWRK2)
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COMPLEX*16 A(LENGTA), EVECS(LDEVEC,N), WORK(LDWORK)
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INTEGER ICOL, IFAIL(N), INFO, IROW, ITEMP
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INTEGER IWORK(LDIWRK), NFOUND
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C
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EXTERNAL ZHPEVX
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INTRINSIC CONJG
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C
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C Initialize the array A to store the coefficient array A
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C shown below.
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C
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C 4 4-4i 0
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C A = 4+4i 4 4-4i
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C 0 4+4i 4
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C
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c DATA A / (4.0D0,0.0D0), (4.0D0,-4.0D0), (4.0D0,0.0D0),
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c $ (0.0D0,0.0D0), (4.0D0,-4.0D0), (4.0D0,0.0D0) /
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DATA A / (4.0D0,8D8), (4.0D0,-4.0D0), (4.0D0,8D8),
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$ (0.0D0,0.0D0), (4.0D0,-4.0D0), (4.0D0,8D8) /
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C
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C Print the initial value of A.
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C
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PRINT 1000
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PRINT 1010, DBLE(A(1)), ZERO, A(2), A(4)
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PRINT 1010, CONJG(A(2)), DBLE(A(3)), ZERO, A(5)
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PRINT 1010, CONJG(A(4)), CONJG(A(5)), DBLE(A(6)), ZERO
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C
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C Compute the eigenvalues and eigenvectors.
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C
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CALL ZHPEVX ('VALUES AND VECTORS', 'ALL VALUES',
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$ 'UPPER TRIANGLE OF A STORED', N, A, TEMP, TEMP,
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$ ITEMP, ITEMP, 0.0D0, NFOUND, EVALS, EVECS,
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$ LDEVEC, WORK, WORK2, IWORK, IFAIL, INFO)
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IF (INFO .LT. 0) THEN
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PRINT 1020, ABS(INFO)
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STOP 1
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ELSE IF (INFO .GT. 0) THEN
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PRINT 1030, INFO
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STOP 2
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END IF
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C
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C Print the eigenvalues and eigenvectors.
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C
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PRINT 1040
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DO 200, IROW = 1, N
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PRINT 1050, EVALS(IROW), (EVECS(IROW,ICOL), ICOL = 1, N)
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200 CONTINUE
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C
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1000 FORMAT (1X, 'A:')
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1010 FORMAT (1X, 10(: 2X, '(', F5.1, ',', F5.1, ')'))
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1020 FORMAT (1X, 'Illegal argument to ZHPEVX, argument #', I2)
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1030 FORMAT (1X, 'Convergence failure, INFO = ', I2)
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1040 FORMAT (/1X, 'Eigenvalue', 16X, 'Eigenvector**T')
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1050 FORMAT (1X, F8.3, 6X, '[', 3('(', F4.1, ',', F4.1, ') '),
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$ ']')
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C
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END
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