You can use the which.i argument to [.xts:
> is.null(SPY["2009-01-18",which.i=TRUE])
[1] TRUE
Best,
--
Joshua Ulrich | about.me/joshuaulrich
FOSS Trading | www.fosstrading.com
On Sat, Jan 25, 2014 at 9:27 AM, ce <zadi...@excite.com> wrote:
> Dear all
>
>
> How to test if xts date exists ? is.null doesn't work. SPY["2009-01-18"]
> doesn't exist but I can't catch it in my script.
>
> library(quantmod)
>
> getSymbols("SPY")
>
> > SPY["2009-01-16"]
> SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
> 2009-01-16 85.86 85.99 83.05 85.06 399237200 76.58
>
>
>
> > SPY["2009-01-18"]
> SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
>
>
> > is.null(SPY["2009-01-18"])
> [1] FALSE
>
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>
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