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...a and a function block_average block_average <- funcition(value,year,number_of_years_to_average) with the parameters value and years as vectors and number_of_years as integer. When I'm trying to skip the spatial aggregation, i.e. just do the block_averaging over years, I have the problem (AFIU the man page), that I can't provide the years vector as parameter to the function block_average via tapply. What would be the R-ish approach to this problem. TIA joachim heidemeier -- Dr. Joachim Heidemeier c/o Umweltbundesamt FG II 2.2 Tel.: +49340 2103-2780 eMail: joachim.heidemeier@uba.d...