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doc ///
Key
sign
(sign, Number)
(sign, Constant)
Headline
sign (signum) function
Usage
sign x
Inputs
x:Number
Outputs
:{ZZ,CC}
Description
Text
When @VAR "x"@ is real, then this returns 1 if it is positive, -1 if it
is negative, and 0 if it is zero.
Example
sign 5
sign (-3)
sign 0
Text
If @VAR "x"@ is complex and nonzero, then this returns $x/|x|$.
Example
sign(-7*ii)
SeeAlso
"GradedLieAlgebras::sign(LieElement)"
"Permutations::sign(Permutation)"
///
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