sinc ( x -- y )

Vocabulary

math.extras

Inputs

x

a number

Outputs

y

a number

Word description

Returns the sinc function, calculated according to sin(pi * x) / (pi * x). The name sinc is short for "sine cardinal" or "sinus cardinalis".

Notes

0 sinc is the limit value of 1.

Definition

USING: kernel math math.constants math.functions ;

IN: math.extras

: sinc ( x -- y ) [ 1 ] [ pi * [ sin ] [ / ] bi ] if-zero ;