只需复制一个简单的代码。但getSymbols总是会抛出错误:
# Set initial values
initDate='2002-07-31'
endDate='2012-10-31'
initEq=100000
start<-"2005-01-01"
end<- format(Sys.Date(),"%Y-%m-%d") # yyyy-mm-dd
# Set currency and instruments
currency("USD")
stock("IEF",currency="USD",multiplier=1)
stock("SPY",currency="USD",multiplier=1)
# Load data with quantmod
print("Loading data")
symbols = c("IEF", "SPY")
getSymbols(symbols, from=start, to=end)
错误:
警告讯息:
1:在download.file中(粘贴(yahoo.URL,“s =”,Symbols.name,“&amp; a =”,from.m,:
) 下载长度108057!=报告长度200
2:在download.file中(粘贴(yahoo.URL,“s =”,Symbols.name,“&amp; a =”,from.m,:
) 下载长度120958!=报告长度200
为什么?