Question

I got a few examples from TTR documentation like:

data(ttrc)

mfi <- MFI(ttrc[,c("High","Low","Close")], ttrc[,"Volume"])

data(ttrc)
price <- ttrc[,"Close"]

data(ttrc)
macd <- MACD( ttrc[,"Close"], 12, 26, 9, maType="EMA" )

data(ttrc)
ema.20 <- EMA(ttrc[,"Close"], 20)

Is data(ttrc) a data-dummy or what?
I want to use

getSymbols("AAPL",src="yahoo") 

for the Series and select the right column from it like ‘close’ or ‘volume’

“series that is coercible to xts or matrix”
How do I transform the timeseries from getSymbols to right matrix to use the examples from the documentation?

Thanks!

Answer 1

The manual, ?ttrc, confirms that the data is random.

You can extract the columns you want with the Ad, Vo, etc. functions or directly with square brackets.

tail( MACD(Ad(AAPL)) )
tail( MACD( AAPL[,"AAPL.Adjusted"] ) )