[R] Count the number of unique days

[bogdan_antonescu]

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




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