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...a b 1 2 3 2 4 6 3 6 9 4 8 12 5 10 15 > x$a/x$a[1] [1] 1 2 3 4 5 > x <- zoo(x) > x$a/x$a[1] 1 1 > I feel understanding this difference would lead me to a greater understanding of the zoo module! Sean. -- Sean Carmody Twitter: http://twitter.com/seancarmody Stable: http://mulestable.net/sean The Stubborn Mule Blog: http://www.stubbornmule.net Forum: http://mulestable.net/ [[alternative HTML version deleted]]