[R] Deleting repeated rows

[Etienne B. Racine]

dreamworx wrote:
> 
> Appologies if this is a simple problem. I have a matrix which is 86x3 and
> each row contains three integers. The problem I have is that some of the
> rows of integers are repeated in other rows and I only wish to have one
> copy of these rows.
> 
> Is there a function that I can use which will identify these repeated rows
> and delete them from the matrix? I have searched for help with this
> problem but the only function I have found is 'grep' which I'm not sure is
> of any use.
> 

?unique

# generate data
set.seed(1001)
m <- matrix(sample(1:3,20*3,TRUE),ncol=3);m

# get unique values
unique(m)

As you can see, row 7 and 20 are 1,1,1... and you get only one row with
1,1,1 in the second matrix.

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