set-axis ( u v axis -- w )

Vocabulary
math.vectors

Inputs

u	a sequence of numbers
v	a sequence of numbers
axis	a sequence of 0/1

Outputs

w	a sequence of numbers

Word description
Using w as a template, creates a new sequence containing corresponding elements from u in place of 0, and corresponding elements from v in place of 1.

Examples

USING: math.vectors prettyprint ; { 1 2 3 } { 4 5 6 } { 0 1 0 } set-axis .
{ 1 5 3 }

Definition

USING: kernel math sequences ;

IN: math.vectors

: set-axis ( u v axis -- w )
[ [ zero? 2over ? ] dip swap nth ] map-index 2nip ;