Hello world, I am actually transferring a course in data management for students in biology, geography and agriculture from statistica to R - it works surprisingly well. If anyone is interested in my scratch/notepad (in German language), please see
www.hydrology.uni-kiel.de/~schorsch/statistik/statistik_datenauswertung.pdf (pages 40-52) The dataset is: www.hydrology.uni-kiel.de/~schorsch/statistik/erle_stat.csv It contains a 10 year dataset. So far for introduction, now comes the problem: we often need cumulative *annual* sums (sunshine, precipitation), i.e. the sum must reset to 0 at the beginning of the year. I know of cumsum(), but I do not now how to split the dataset automagically into annual pieces so I can cumsum() every year separately. I have the strong hope that the solution is one of these one-liners which leave the students with eyes wide open in surprise and makes them true believers in the power of the command-line 8-). Thanks & Greetings Georg -- Georg Hoermann, Luebeck, Germany Tel. 0451/47 70 32, 0172/431 57 15, Penguin #189476 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
