[R] filter data frames

[Christophe Weibel]

Hello!

I'm looking for an easy way to filter data frames.

Some rows in my data frame needs to be left out,
for instance, rows with invalid data.

Right now, if I want to pair two columns of this data frame,
I have to do this:

> pairs(as.data.frame(list(tstart=df$tstart[valid],tend=df$tend.sdr[valid])))

or this:

> pairs(cbind(df$tstart,df$tend)[valid,],labels=c("tstart","tend"))

where 'valid' is a logical vector of valid rows.

Is there a way to filter a data frame without making a vector of
the columns, thus losing the column names?

Okay, perhaps I'm greedy. It's already working, what am I complaining
about? 

-- 
Christophe Weibel
_________________________
christophe.weibel at epfl.ch
Phone:    +41 21 312-3525
Prof:     +41 21 69-34244
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