function range( N, x, strideX ) {
	return ndarray( N, x, strideX, stride2offset( N, strideX ) );
}
Computes the range of a strided array.

@param {PositiveInteger} N - number of indexed elements
@param {NumericArray} x - input array
@param {integer} strideX - stride length
@returns {number} range

@example
var x = [ 1.0, -2.0, 2.0 ];

var v = range( x.length, x, 1 );
// returns 4.0