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.
Count the number of unique days
2 messages · bogdan_antonescu, Jeff Newmiller
Certainly it is possible. One way might involve using the "unique" function based on location and date before attaching the data to your SPDF.
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On February 24, 2014 4:17:47 AM PST, bogdan_antonescu <bogdan.antonescu at 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.
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