[R] How to rank matrix data by deciles?

[vincent.deluard]

Hi R users,

I have a matrix of data similar to:

> y=matrix(rnorm(55),ncol=5)


I would like to know to which decile each number belongs compared to the
numbers in its column.

Say y[1,1] is the third decile among y[1:11,1] and y[2,1] is in the second
decile
I would like get a matrix that would return their ranks in decile, i.e., 

y[1,1] -> 3
y[2,1] -> 2

Your help is much appreciated!
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