r - 名称的 dropTA 特定指标

Question

无法弄清楚如何从 R quantmod 的 TA 列表中按名称删除指定的指标。

require("quantmod")
getSymbols("AAPL", src="yahoo", from = '2018-01-1', to = '2019-01-1')
#my custom indicator
AAPL_sma_50 <- SMA(
 Cl(AAPL),
 n = 50
)
candleChart(AAPL, up.col = "black", dn.col = "red", theme = "white")
addTA(AAPL_sma_50, on = 1, col = "blue")
addBBands()
listTA()

listTA()输出:

[[1]] addVo()

[[2]] addTA(ta = AAPL_sma_50, on = 1, col = "blue")

[[3]] addBBands()

我可以使用 dropTA('addBBands') 进行删除内置操作，但不能以同样的方式删除自定义指标:

dropTA('AAPL_sma_50')
Error in dropTA("AAPL_sma_50") : nothing to remove

dropTA(2) is not working by index either - it always deletes first element

我如何才能只删除第二个自定义项，或者如何创建它，以便以后可以按名称删除 - 例如 dropTA('myCustomIndicator')

Answer 1

有几个选项可以从图中删除 TA。诀窍是要知道，当您使用 addTA(my_indicator) , 你不能使用 dropTA(my_indicator) .因为您通过 addTA() 添加了 TA ，所以您需要调用dropTA(ta = "addTA") .

现在有几种可能:

dropTA(all = TRUE) # removes all technical indicators
dropTA(ta = "addBBAnds") # removes the bolinger bands you added via addBBands()

如果您使用 addTA 添加了一些自定义 TA，如果您现在订购，则可以指定要删除的版本。

dropTA(ta = "addTA", occ = 2) # removes the second occurence of the TA you added
dropTA(ta = "addTA", all = TRUE) # removes all TA's added with addTA

当您在图表中使用了多个 addEMA 或 addSMA 指标时，这很有用。

EMA 指标示例:

library(quantmod)
getSymbols("AAPL", src="yahoo", from = '2018-01-1', to = '2019-01-1')

candleChart(AAPL, up.col = "black", dn.col = "red", theme = "white")
addEMA(Cl(AAPL), n = 13, on = 1)
addEMA(Cl(AAPL), n = 21, on = 1)
addEMA(Cl(AAPL), n = 5, on = 1)

dropTA(ta = "addEMA", occ = 2) # removes the second occurence of the EMA's you added
dropTA(ta = "addEMA", all = TRUE) # removes all (other) EMA's added