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PROGRAM TEST
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IMPLICIT NONE
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C
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INTEGER LDA, LDB, LDWORK, M, N
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PARAMETER (M = 3)
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PARAMETER (N = 3)
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PARAMETER (LDA = M)
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PARAMETER (LDB = LDA)
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PARAMETER (LDWORK = N)
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C
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DOUBLE PRECISION A(LDA,N), WORK(LDWORK)
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INTEGER ICOL, INFO, IROW, IPIVOT(N)
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C
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EXTERNAL DGETRF, DGETRI
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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 1 4 6
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C A = 2 9 14
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C 3 14 23
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C
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DATA A / 1.0D0, 2.0D0, 3.0D0,
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$ 4.0D0, 9.0D0, 1.4D1,
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$ 6.0D0, 1.4D1, 2.3D1 /
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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, ((A(IROW,ICOL), ICOL = 1, N), IROW = 1, M)
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C
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C LU factor A, then use the factorization to compute the
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C inverse.
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C
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CALL DGETRF (M, N, A, LDA, IPIVOT, INFO)
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IF (INFO .EQ. 0) THEN
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CALL DGETRI (N, A, LDA, IPIVOT, WORK, LDWORK, INFO)
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IF (INFO .EQ. 0) THEN
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PRINT 1020
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PRINT 1010, ((A(IROW,ICOL), ICOL = 1, N), IROW = 1, M)
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ELSE
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PRINT 1030, INFO
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END IF
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ELSE
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PRINT 1040, INFO
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END IF
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C
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1000 FORMAT (1X, 'A:')
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1010 FORMAT (3(3X, F4.1))
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1020 FORMAT (/1X, 'A**(-1):')
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1030 FORMAT (1X, 'Inverse failed with INFO = ', I6)
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1040 FORMAT (1X, 'Factorization failed with INFO = ', I6)
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C
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END
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