Certainly it is possible. One way might involve using the "unique" function based on location and date before attaching the data to your SPDF. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity.
On February 24, 2014 4:17:47 AM PST, bogdan_antonescu <bogdan.antone...@manchester.ac.uk> wrote: >Hi All, > >I am working on a script to that is producing a lightning density map >(numer >of lightning flashes per area) based on a data set containing: >date(year/month/day), time(hh/mm/ss), latitude, and longitude for each >lightning flash. The attaches script is producing this map using a >hexagonal >grid. I am wondering if it is also possible to count the number of >unique >days in each grid cell, in order to produce a map with the number of >day >with lightning. > >script: >https://dl.dropboxusercontent.com/u/51871539/lightning_density.r >data sample: >https://dl.dropboxusercontent.com/u/51871539/lightning_test.csv > >Thank you very much for your help. > >Cheers, >Bogdan > > > > >-- >View this message in context: >http://r.789695.n4.nabble.com/Count-the-number-of-unique-days-tp4685740.html >Sent from the R help mailing list archive at Nabble.com. > >______________________________________________ >R-help@r-project.org mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.