Sorry, this is my first time to post.
I have a big data set: first colume is date (ex: 2008-2-150, the second is time
(10:30:00), and the following columes are variaty measurement data. Every 30
min, I have one data.
I want to find an effecient way to calculate the hourly, daily, monthly and
yearly average, and plot them, and eventually use these average data to do
further analysis.
Thanks!
Jeff
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