Name: Sign - returns the sign of its argument

Synopsis:

integer Sign -1,0, or 1 
double  Sign -1,0, or 1


Description:

The C++ standard library does not define a sign function because 
there is no general agreement on the return value for 0. The function 
Sign implements the decision made for Mathematica: if the argument is 
0, Sign returns 0.


Parameters:

The return value is always an integer


References:

[1] The Mathematica Book "Sign"


Author:

Diesmann


FirstVersion:

2007.11.28


SeeAlso:

UnitStep
abs

Source:

/var/www/debian/nest/nest-simulator-2.20.0/lib/sli/mathematica.sli
