I am new to R. I am trying to process this huge data set of matrix containing four columns, say x1, x2, x3, x4 and n number of rows.
I want to aggregate the matrix by x1 and perform statistic based on columns x2, x3, x4.
Someone will probably give you a way to do this directly in R, but if your data set is truly huge, at least one option is to use a PostgreSQL database for the data, and define a custom aggregate using PL/R. For a simple example, see:
http://www.joeconway.com/plr/doc/plr-aggregate-funcs.html
HTH,
Joe
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