signum ( x -- y ) - Factor Documentation

signum ( x -- y )


Vocabulary
math .functions

Inputs
x a number


Outputs
y a number


Word description
Calculates the signum value. For a real number, x, this is its sign (-1, 0, or 1). For a complex number, x, this is the point on the unit circle of the complex plane that is nearest to x.

Definition
IN: math.functions

GENERIC: signum ( x -- y )


Methods
USING: kernel math math.functions ;

M: complex signum dup abs / ;


USING: math math.functions ;

M: real signum sgn ;

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