Sign

The sign of x: -1, 0, or 1 for negative, zero, or positive x.

WikipediaSign functionMathWorldSignWikidataQ236813DLMFfront/introduction.common.t2.r18FungrimSign✓Fungrim entryFindStatSt000037via Permutation✓Wolfram LanguageSign✓

Sign(x)-1, 0, or 1 for negative, zero, or positive real x; for complex z.

SageMathsign(x)SymPysign(x)mpmathsign(x)

Domain: Arithmetic

Details

for , , respectively.
For a complex number, , the unit complex number pointing toward z. See Abs.
Recovers the original magnitude: .
, but propagates as NaN rather than 0.

Examples

See also: Abs, Negate