On Mar 20, 2010, at 1:17 PM, Gaathier Mahed wrote:

> Dear Sir/madam
>
> I am a new user to R. I have no background in coding or even
> scripting. It seems as if R would be the best tool in order to analyse
> large sets of data. I need to sum hourly readings for the day and then
> sum daily into monthly readings. i also need to do the same for
> another set of data, but average instead of sum. How do I do this?

Rather than asking for a tutorial on data management, you should:
a) read some introductory texts (look for "contributed" at the main r-
project site)
b) read the Posting Guide [ ... or reverse a) and b) ]
c) construct a prototypical data object in R and using the skills
exemplified in hte Posting Guide post a minimal example of what you
are starting with and what you expect.

--

David Winsemius, MD
West Hartford, CT

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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.