compute signum

compute.signum( x[, opts] )

Evaluates the signum function, where x may be a single numeric value or a numeric array.

var sgn = compute.signum( -10 );
// returns -1

var sgns = compute.signum( [ -10, -1, -0, 0, 1, 10 ] );
// returns [ -1, -1, -0, 0, 1, 1 ]

For object arrays, provide an accessor function for accessing numeric values.

var data = [
	[1,-10],
	[2,-1],
	[3,-0],
	[4,0],
	[5,1],
	[6,10]
];

function getValue( d, i ) {
	return d[ 1 ];
}

var sgns = compute.signum( data, {
	'accessor': getValue
});
// returns [ -1, -1, -0, 0, 1, 1 ]

For additional options, see compute-signum.