我有一個數據框架的股票數據,包含100多隻股票的信息10年。我試圖在quantmod上運行這個數據的MACD函數,但不知道如何分割不同股票的計算。例如我的數據幀的一點點看起來是這樣的:應用按因子分解的函數
data<-structure(list(market = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L,
2L, 3L, 3L), .Label = c("AD1", "AD2", "AD3"), class = "factor"),
date = structure(c(15623, 15624, 15625, 15628, 15623, 15624,
15625, 15628, 15625, 15628), class = "Date"), open = c(101.52,
101.68, 102.1, 101.99, 100.73, 100.85, 101.57, 101.01, 100.56,
100.42), high = c(102.07, 102.39, 102.36, 102.07, 101.4,
101.59, 101.62, 101.35, 100.56, 100.71), low = c(101.26,
101.56, 101.63, 101.5, 100.59, 100.85, 101.07, 100.97, 100.56,
100.41), last = c(101.78, 102.08, 101.76, 101.91, 101.08,
101.37, 101.06, 101.21, 100.41, 100.56)), .Names = c("market",
"date", "open", "high", "low", "last"), row.names = c(1L, 2L,
3L, 4L, 5L, 6L, 7L, 8L, 11L, 12L), class = "data.frame", na.action = structure(9:10,.Names = c("9",
"10"), class = "omit"))
我如何通過這個數據幀到MACD功能的同時得到它分別計算每一個市場。感謝您的幫助。我是R新手。
這是一個良好的開端:http://stackoverflow.com/questions/3505701/r-grouping-functions-sapply-vs-lapply-vs-apply-vs-tapply-vs-by- vs-aggrega – harkmug 2013-04-11 18:39:43