DESCRIPTION
Returns the absolute value of number.
USAGE
abs(-18)    - returns 18
abs(11)     - returns 11
abs(-1.974) - returns 1.974
 
SEE ALSO
sin(E), asin(E), cos(E), acos(E), tan(E), atan(E), log(E), exp(E), sqrt(E), floor(E), ceil(E), pow(E), sgn(E)