/**
* Returns the log-log interpolated or extrapolated y-value using the
* supplied x- and y-value arrays.
*
* @param xs x-values of some function
* @param ys y-values of some function
* @param x value at which to find y
* @return the log-log interpolated y-value
*/
public static function findLogLogY($xs, $ys, $x)
{
$i = RTGM_Util::dataIndex($xs, $x);
return exp(RTGM_Util::findY(log($xs[$i]), log($ys[$i]), log($xs[$i + 1]), log($ys[$i + 1]), log($x)));
}
