Hi all,
I have three columns of lightning data. The first column is dates, the
second and third are latitude and longitude respectively. The data is
extremely large as many observations are made every second. Using the factor
function reduces the activity to a few number per a day.
But factor and tapply functions appear to neglect the other two columns and
only factored the first column. But the two columns are my main interest
area. I wish to have an impression of lightning activity per day with
respect to latitude and longitude. I was only using the date column to
attempt factoring and hence calculate the daily average of the other two
columns.
Can anybody please give me a hint on how to go about this problem.
Thanks in advance.
Ogbos
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