[R] shrink a dataframe for plotting

[jim holtman]

Try 'hexbin' for plotting this many points.

On Nov 21, 2007 5:05 AM, Alexy Khrabrov <alexy.khrabrov at gmail.com> wrote:
> I get tables with millions of rows.  For plotting to a screen-size
> jpg, obviously just about 1000 points are enough.  Instead of feeding
> plot() the original millions of rows, I'd rather shrink the original
> dataframe, using some kind of the following interpolation:
>
> -- split dataframe into chunks of N rows each, e.g. 1000 rows each
> -- compute average for each column
> -- issue one new row of those averages into the shrunk result
>
> Is there any existing package to do that in R?  Otherwise, which R
> idioms are most effective to achieve that?
>
> Cheers,
> Alexy
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?