h.prtoaf

来自「强大的数学工具包」· PRTOAF 代码 · 共 24 行

                               * * * * * * *
                               *  prtoaf   *
                               * * * * * * *

        "projective to affine"
        SYNTAX: X = prtoaf(P1)

        P is an expression whose value is a projective point on an 
        elliptic curve.

        X is assigned the corresponding affine point.


        Example 1: (correct)

                prtoaf(PT(0, 3, 1))


        Example 2: (incorrect)

                prtoaf(O)
                
_ERR_NR_116