
Check as.Date

> Date: Wed, 11 Mar 2009 06:25:44 -0700
> From: qflichem@yahoo.com
> To: r-help@r-project.org
> Subject: [R] How to monthly,daily,yearly average
> 
> 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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> 
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