(PECL trader >= 0.2.0)
trader_natr — Normalized Average True Range
$high
$low
$close
$timePeriod
high
高値。実数値の配列。
low
安値。実数値の配列。
close
終値。実数値の配列。
timePeriod
Number of period. Valid range from 2 to 100000.
Returns an array with calculated data or false on failure.
