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...he mean() command in R and got: > mean(c(1,NA,NA)[-1], trim = .1, na.rm = TRUE) [1] Inf I think the problem is in the na.rm = TRUE, because I get: > mean(c(1,NA,NA)[-1]) [1] NA How serious is this problem, and is there a workaround ? thank you Kate ------------------------------ Kate Fissell Systems Analyst University of Pittsburgh 3939 O'Hara St. Pittsburgh PA 15260 (412) 624-5279 fax: (412) 624-9149 fissell+ at pitt.edu

Dear R users I am currently investigating time series analysis using an irregular time series. Our study is looking at vegetation change in areas of alien vegetation growth after clearing events. The irregular time series is sourced from Landsat ETM+ data, over a six year period I have 38 scenes. For certain periods I have monthly data while for others, images are up to three months apart. So far