计算某一只证券的SAR技术指标。输入参数为股票的最高价，最低价，收盘价，以及计算SAR的参数设定。输出参数为SAR的计算值，以及股票相应的买卖点-Calculate the SAR technical indicators of particular securities. The highest price of the input parameters for the stock, the lowest closing price, as well as the calculation of the SAR parameter setting. The calculated value of the output parameters for the SAR, as well as stock trading point