h.sgn

来自「强大的数学工具包」· SGN 代码 · 共 23 行

                               * * * * * * *
                               *    sgn    *
                               * * * * * * *

        "sign"
        SYNTAX: X = sgn(A)

        A is an expression whose value is an element of Z, Q or R.

        X is assigned the sign of A.


        Example 1: (correct)

                sgn(2^(2 : 3) - gcd(lcm(23, 15), 7 + 8 * 12) / 12)


        Example 2: (incorrect)

                sgn(x*y + 2)
                
_ERR_NR_024