Sign

Usage

• Sign[x] gives -1, 0 or 1 depending on whether x is negative, zero, or positive.

Notes

• Mathematical function (see Section A.3.10).

• For non-zero complex numbers z, Sign[z] is defined as z/Abs[z].

• Sign tries various transformations in trying to determine the sign of symbolic expressions.

• For exact numeric quantities, Sign internally uses numerical approximations to establish its result. This process can be affected by the setting of the global variable $MaxExtraPrecision.

• See Section 3.2.2.

• See also: Abs, UnitStep, Piecewise, Clip, Positive, Negative, NonNegative, Greater, Simplify, Assumptions.

• New in Version 1; modified in 3.

Further Examples