[R-SIG-Finance] using findPeaks in designing railing-stops?

[R. Michael Weylandt]

It looks like you need to wrap coredata() because some funny
arithmetic is happening when the xts-ness is preserved.

e.g.

findPeaks(coredata(Ad(SPY)), 5)

But this is perhaps a less-than-desirable feature. I'll patch it and
send it to Josh.

Michael

On Thu, Feb 9, 2012 at 9:56 PM, Michael <comtech.usa at gmail.com> wrote:
>  Hi all,
>
> I am having trouble using the function "findPeaks":
>
> tickers="SPY"
>
> data *<-* new.env()
>
> getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data,
> auto.assign = T)
>
> p=findPeaks(data$SPY[, 6], 5)
>
> plot(data$SPY[, 6], type="l")
>
> points(p, data$SPY[, 6][p])
>
> My goal is to implement a trailing-stop on a buy-and-hold strategy using
> findPeaks...
>
> I wanted to detect whenever SPY falls 5 points from the local peak...
>
> The above example failed in finding the peaks (p == NULL).
>
> Am I missing anything here?
>
> Thanks a lot!
>
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>
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