[R] Creating vectors

[clips10]

I didn't really know what to post as the topic subject, but I have a vector,
for instance (2,2,4,6,2,4,4,6,8,6) and I want to create another vector which
is just numbers from 1 to 4 since there are only 4 unique numbers in my
vector, so for instance 2 would be 1, 4 would be 2, 6 would be 3, and 8
would be 4, so my new vector would be 

(1,1,2,3,1,2,2,3,4,3). The vector I have has longer numbers, in the
thousands, but it's the same principle I want. I have a vector of length 200
but I know there are only 160 unique numbers in there, so would like a new
vector that just has numbers between 1 and 160 correpsonding to each unique
element of the original vector, and is the same length as the original.

Sorry if this is not very clear,

Thanks very much for any help in advance.
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