Sign

Working with permutations? See sign (permutations)

Returns the sign of a number.

sign(Real)
sign(Complex)

Description

sign(Real)

Given a real number $x$ , returns its sign: $text sign end text left parenthesis x right parenthesis equals open curly brackets table attributes columnalign left end attributes row cell 0 comma space text if end text space x equals 0 end cell row cell 1 comma space text if end text space x greater than 0 end cell row cell negative 1 comma space text if end text space x less than 0 end cell end table close$

sign(Complex)

Given a complex number $z$ , returns $text sign end text left parenthesis z right parenthesis space equals space open curly brackets table attributes columnalign left end attributes row cell 0 comma space text if end text z equals 0 end cell row cell fraction numerator z over denominator open double vertical bar z close double vertical bar end fraction comma space text if end text space z not equal to 0 end cell end table close$

Sign0, Negative?, Positive?

Sign

Syntax

Description

sign(Real)

sign(Complex)

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