det ( coord coord -- n )

Vocabulary

project-euler.102.private

Inputs

coord	an object
coord	an object

Outputs

n

an object

Definition

USING: arrays kernel math sequences ;

IN: project-euler.102.private

: det ( coord coord -- n )
    dupd [ [ last ] bi@ - ] [ [ first ] bi@ - ] 2bi 2array
    [ [ first ] bi@ * ] [ [ last ] bi@ * ] 2bi - ;