Arithmetic functions - Factor Documentation (original) (raw)

Arithmetic functions
Factor handbook » The language » Numbers » Mathematical functions

Computing additive and multiplicative inverses:
neg ( x -- -x )
recip ( x -- y )

Complex conjugation:

conjugate ( z -- z* )

Tests:

zero? ( x -- ? )

between? ( x min max -- ? )

Control flow:

if-zero ( ..a n quot1: ( ..a -- ..b ) quot2: ( ..a n -- ..b ) -- ..b )

when-zero ( ... n quot: ( ... -- ... x ) -- ... x )
unless-zero ( ... n quot: ( ... n -- ... ) -- ... )

Sign:

sgn ( x -- n )

Rounding:

ceiling ( x -- y )

floor ( x -- y )
truncate ( x -- y )
round ( x -- y )
round-to-decimal ( x n -- y )
round-to-step ( x step -- y )

Inexact comparison:

~ ( x y epsilon -- ? )

Numbers implement the Linear order protocol, therefore operations such as min and max can be used with numbers.