h.pgen

来自「强大的数学工具包」· PGEN 代码 · 共 44 行

                               * * * * * * *
                               *   pgen    *
                               * * * * * * *

        "prime generator"
        SYNTAX: X = pgen(a, b)

        a an b are expressions whose values are positive integers, 
        a <= b.

        pgen displays a list of all primes with a <= p <= b.
        If [a, b] contains at least one prime, the smallest prime
        in [a, b] is assigned to X; otherwise, X = 0.

        All prime numbers in [a, b] besides X are stored in increasing
        order in AV (see "?avfunc").

        Warning: If you want only to construct one prime, please use
                 pconstr.


        Example 1: (correct)

                p = pgen(2^30, 2^30 + 10)


        Example 2: (correct)

                pgen(12, 100)


        Example 3: (incorrect)

                pgen(-4, 3)

_ERR_NR_034_pgen_             


        Example 4: (incorrect)
 
                pgen(2^35, 2^34)
                
_ERR_NR_034_pgen_