leading ( seq -- n elt )

Vocabulary

math.matrices.elimination

Inputs

seq	a sequence

Outputs

n	the index of the first match, or f.
elt	the first non-zero element, or f.

Word description

Find the first non-zero element of a sequence.

Definition

USING: kernel math sequences ;

IN: math.matrices.elimination

: leading ( seq -- n elt ) [ zero? not ] find ;