h.herm

强大的数学工具包

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                                *    herm   *
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        "Hermite normal form"
        SYNTAX: X = herm(A, np)

        A is a regular square matrix over Z.
        np is 1 or -1.

        X is assigned the Hermite normal form of A.
        If np =  1, all entries below the diagonal are >= 0,
        if np = -1, all entries below the diagonal are <= 0,


        Example 1: (correct)

                herm({{1, 2} {0, 1}}, 1)


        Example 2: (correct)

                herm({{1, 2} {0, 1}}, -1)


        Example 3: (incorrect)

                herm({{1, x} {y, 1}}, 1)

_ERR_NR_097


        Example 4: (incorrect)

                herm({{1, 0} {1, 0}}, -2)

_ERR_NR_096