[R] parttioning a matrix corresponding to different levels of y

From: suman dhara <suman.dhara89_at_gmail.com>
Date: Fri, 04 Jun 2010 10:29:12 +0530

I have a problem regarding partitioning a matrix.I state my problem as follows:

I have a y vector of length say 1000.Variable y has 4 levels say 0,1,2.Corresponding to each y(response), I have a x-vector(explanatory) as a row of X matrix.Now, I want to partition the X matrix into 3 submatrices say x1,x2,x3 corresponding to each level of y.Is there any function to do this in R or how can I do this in R?

For your convinience I attach a sample version of data.

Suman Dhara

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