title: how do you make a sequence using along.with for unique values in r
body: <p>Lets suppose I have a vector of numeric values</p>
  
  <pre><code>  [1]  2844  4936  4936  4972  5078  6684  6689  7264  7264  7880  8133  9018  9968  9968 10247
   [16] 11267 11508 11541 11607 11717 12349 12349 12364 12651 13025 13086 13257 13427 13427 13442
   [31] 13442 13442 13442 14142 14341 14429 14429 14429 14538 14872 15002 15064 15163 15163 15324
   [46] 15324 15361 15361 15400 15624 15648 15648 15648 15864 15864 15881 16332 16847 17075 17136
   [61] 17136 17196 17843 17925 17925 18217 18455 18578 18578 18742 18773 18806 19130 19195 19254
   [76] 19254 19421 19421 19429 19585 19686 19729 19729 19760 19760 19901 20530 20530 20530 20581
   [91] 20629 20629 20686 20693 20768 20902 20980 21054 21079 21156
  </code></pre>
  
  <p>and I want to create a sequence along this vector but for unique numbers. for example </p>
  
  <pre><code>length(unique(vector))
  </code></pre>
  
  <p>is 74 and there are a total of 100 values in the vector. The sequence should have numbers ranging from 1 - 74 only but with length 100 as some numbers will be repeated.</p>
  
  <p>Any idea on how this can be done?
  Thanks.</p>