[R] analyze subsample of dataframe

[jim holtman]

x$judy[x$year == 2004] <- x$judy[x$year == 2004] - 1

On Tue, Sep 16, 2008 at 6:02 PM, T.D.Rudolph <prairie.picker at gmail.com> wrote:
>
> Hi there,
>
> I'm dealing with a pretty big dataset (~22,000 entries) with numerous
> entries for every day over a period of several years.  I have a column
> "judy" (for Julian Day) with 0 beginning on Jan. 1st of every new year (I
> want to compare tendencies between years).  However, in order to control for
> a leap year (2004), I simply need to subtract 1 from every judy value for
> the year 2004 (without altering judy values from other years!).  What is the
> most effective way of going about this?  Can I integrally subset within a
> function of some form?
>
> Merci
> Tyler
> --
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>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?