1
我有数据集充满这样的:列名后lapply
tickers <- c("SPY","DIA")
l_ply(tickers, function(sym) try(getSymbols(sym, from="2012-03-01",
to=Sys.Date())))
ClosePrices <- do.call(merge, lapply(tickers, function(x) Cl(get(x))))
tail(ClosePrices)
SPY.Close DIA.Close
2012-06-29 136.10 128.45
2012-07-02 136.51 128.36
和
rsipx <- do.call(merge, lapply(ClosePrices, FUN=function(ClosePrices) RSI(ClosePrices)))
tail(rsipx)
SPY.Close DIA.Close
2012-06-29 58.36391 58.92043
2012-07-02 59.37153 58.53483
我解决不了的问题是,当我将一个函数它为每个输入生成多个列。在这种情况下ADX产生4个值(DIP DIn为DX ADX):
adxpx <- do.call(merge, lapply(tickers, FUN=function(tickers) ADX(get(tickers))))
tail(adxpx)
DIp DIn DX ADX DIp.1 DIn.1 DX.1 ADX.1
2012-06-29 53.47713 35.90631 19.65780 15.30299 55.14765 36.05527 20.93395 18.20818
2012-07-02 55.79485 32.58420 26.26262 16.08582 56.67699 33.08770 26.27903 18.78467
我怎样才能得到相应的列名,而不是一个数? (DX.DIA而不是DX.1),还是只选择$ ADX命名列?
伟大的古兰!那正是我要找的,谢谢! – 2012-07-09 08:08:46