Try this:
with(DF, tapply(code, list(year, month, code), length))
On Tue, Sep 23, 2008 at 8:10 PM, Hutchinson,David [PYR]
<[EMAIL PROTECTED]> wrote:
> Hi R-Users,
>
> I have a data frame containing year, month, day, and code columns. The
> code column is a unique character of set ('E','A','B') - I am trying to
> determine an efficient way of summarizing the count of each of these
> codes by month and year without having to use for...loops and subsets.
> Does anyone have any suggestions?
>
> Thanks in advance,
> Dave
>
> Here is a snapshot of my data frame:
>
> year month day code
> 8006 1935 12 1 E
> 8007 1935 12 2
> 8008 1935 12 3 E
> 8009 1935 12 4
> 8010 1935 12 5 E
> 8011 1935 12 6 E
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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and provide commented, minimal, self-contained, reproducible code.
