> new.environment <- new.env()
> getFX("HKD/USD",from="2015-01-01",to="2015-12-31",env=new.environment)
[1] "HKDUSD"
Warning message:
In getSymbols.oanda(Symbols = Currencies, from = from, to = to,  :
  Oanda only provides historical data for the past 180 days. Symbol: HKD/USD
为什么不显示呢？只能读取最近180天的吗？
还有如果想要各种货币对美元的汇率，应该怎样设置参数呢，要用正则表达式么