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...a bit confused about why that is. I could coerce them back to POSIXct with another line of code, but is there a better way? And is there a way to avoid using a for loop to complete this task? No need to say I am quite new to R, so apologies for any obvious mistake or oversight. Many thanks A. Duranel, UCL Department of Geography [[alternative HTML version deleted]]

Hello Let's say I have a multivariate zoo timeseries (synchronised automatic loggers at different places): library(zoo) library(lattice) library(latticeExtra) x<-zoo(data.frame(a=rnorm(100), c=rnorm(100), b=rnorm(100)), seq(from=as.Date("2010-01-01"), by="day", length.out=100)) and a dataframe with manual control points at variable dates: