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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