Suman take a look if this suffices your purpous

x <- data.frame(y=as.factor(sample(0:2,1000,replace=TRUE)),x=runif(1000))

x1 <- x[x$y==0,]

x2 <- x[x$y==1,]

x3 <- x[x$y==2,]

On Fri, Jun 4, 2010 at 10:29 AM, suman dhara <

[hidden email]>wrote:

> Sir,

> 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.

>

Use dput() and paste it in your mail

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