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Dear R-helpers, I have 4-dimensional atmospheric data (x,y,z,t), which I want to analyse on spatio-temporal diversities. As far as I understand there only exists the possibility to construct time series as two-dimensional matrices (mts). For the moment, I hold it in different objects: 1. a four-dimensional array for the spatial related analyses 2. a two-dimensional mts timeserie, which was

Dear List, At 32 degrees Celsius in the office, I was too lazy to figure out the correct xapplytion for a simple lookup problem and regressed to well-known c-style. Only to see my computer hang forever doing 10000 indexed offset calculation. Boiled down, the problem is shown below; needs a few milliseconds in c. Looking at the timing results of n=2000 and n=4000, this is not linear in time, so