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List: r-sig-finance
Subject: Re: [R-SIG-Finance] expanding xts object - adding a day
From: "Brian G. Peterson" <brian () braverock ! com>
Date: 2011-10-31 13:10:07
Message-ID: 1320066607.12096.105.camel () brian-rcg
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On Mon, 2011-10-31 at 13:58 +0100, Martin Bauer wrote:
> Hi Brian,
>
> yes rbind finally but I thinking of something like this - not sure if that could lead to a solution
<snipped because it doesn't make any sense>
> I'm lost at this point
Clearly.
> getSymbols('SPY')
[1] "SPY"
> tail(SPY)
SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
2011-10-21 123.09 124.12 122.72 123.97 278872100 123.97
2011-10-24 124.17 125.80 124.06 125.49 202862400 125.49
2011-10-25 124.89 124.95 122.78 123.05 268433100 123.05
2011-10-26 124.35 124.77 122.21 124.30 288818700 124.30
2011-10-27 127.63 129.42 124.32 128.63 389788900 128.63
2011-10-28 128.00 128.85 127.80 128.60 225638800 128.60
>SPY<-rbind(SPY,xts(matrix(c(126.5,126.6,126.425,126.55,NA,NA),nrow=1),order.by=as.Date(Sys.Date())))
> tail(SPY)
SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
2011-10-24 124.17 125.80 124.060 125.49 202862400 125.49
2011-10-25 124.89 124.95 122.780 123.05 268433100 123.05
2011-10-26 124.35 124.77 122.210 124.30 288818700 124.30
2011-10-27 127.63 129.42 124.320 128.63 389788900 128.63
2011-10-28 128.00 128.85 127.800 128.60 225638800 128.60
2011-10-31 126.50 126.60 126.425 126.55 NA NA
You don't need anything other than rbind and xts.
--
Brian
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