[R] RE : Create sequence for dataset

[ssim@lic.co.nz]

Dear members,

I want to create a sequence of numbers for the multiple records of
individual animal in my dataset. The SAS code below will do the trick, but
I want to learn to do it in R. Can anyone help ?

data ht&ssn;
set ht&ssn;
by anml_key;
if first.anml_key then do;
seq_ht_rslt=0;
end;
seq_ht_rslt+1;

Thanks in advance.

Stella
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