[R] newbie question

[Chuck Cleland]

Larry White wrote:
> Sorry - this must be obvious, but i haven't been able to find the
> answer in the guides i've searched.  The examples seem to assume you
> always want to look at all the data.
> 
> I want to be able to filter data in a dataframe before analyzing it.
> For example, I'd like to plot(a,b) but only include values where b >
> 1000.
> 
> I'd also like to be able to do similar filtering before doing other
> statistical functions.

  In addition to what Paul Hiemstra mentioned, you should look at the
help page for subset().  For example:

df <- data.frame(a = runif(20), b = 1:20)
plot(a ~ b, data = subset(df, b > 5))

> Thanks for your help.
> 
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-- 
Chuck Cleland, Ph.D.
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