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PROGRAM TEST
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IMPLICIT NONE
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C
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INTEGER IDODET, IDOINR, IDOINV, LDA, N
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PARAMETER (IDODET = 10)
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PARAMETER (IDOINR = 100)
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PARAMETER (IDOINV = 1)
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PARAMETER (N = 4)
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PARAMETER (LDA = N)
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C
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DOUBLE PRECISION A(LDA,N), DET(2), WORK(N)
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INTEGER ICOL, INERT(3), INFO, IPIVOT(N), IROW, JOB
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C
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EXTERNAL DSIFA, DSIDI
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C
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C Initialize the array A to store the matrix A shown below.
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C
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C -.5 -.5 -.5 -.5
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C A = -.5 -1.5 -1.5 -1.5
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C -.5 -1.5 -2.5 -2.5
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C -.5 -1.5 -2.5 -3.5
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C
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DATA A / -5.0D-1, 3*8D8, -5.0D-1, -1.5D0, 2*8D8, -5.0D-1,
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$ -1.5D0, -2.5D0, 8D8, -5.0D-1, -1.5D0, -2.5D0,
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$ -3.5D0 /
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C
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PRINT 1000
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DO 100, IROW = 1, N
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PRINT 1010, (A(ICOL,IROW), ICOL = 1, IROW),
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$ (A(IROW,ICOL), ICOL = IROW + 1, N)
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100 CONTINUE
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PRINT 1020
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PRINT 1010, ((A(IROW,ICOL), ICOL = 1, N), IROW = 1, N)
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CALL DSIFA (A, LDA, N, IPIVOT, INFO)
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IF (INFO .EQ. 0) THEN
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JOB = IDOINR + IDODET + IDOINV
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CALL DSIDI (A, LDA, N, IPIVOT, DET, INERT, WORK, JOB)
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PRINT 1030, DET(1) * (10.0D0 ** DET(2))
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PRINT 1040, INERT
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PRINT 1050
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DO 110, IROW = 1, N
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PRINT 1010, (A(ICOL,IROW), ICOL = 1, IROW),
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$ (A(IROW,ICOL), ICOL = IROW + 1, N)
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110 CONTINUE
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ELSE
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PRINT 1060
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END IF
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C
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1000 FORMAT (1X, 'A in full form:')
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1010 FORMAT (4(3X, F5.1))
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1020 FORMAT (/1X, 'A in symmetric form: (* in unused elements)')
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1030 FORMAT (/1X, 'Determinant of A: ', F6.3)
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1040 FORMAT (1X, 'Inertia of A: <', I1, ',', I1, ',', I1, '>')
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1050 FORMAT (/1X, 'A**(-1):')
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1060 FORMAT (/1X, 'A is too poorly conditioned.')
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C
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END
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