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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.