Create sequence of repeated values in sequence

Question

I need a sequence of repeated numbers  i e  1 1     1 2 2     2 3 3     3 etc  The way I implemented this was     nyear  lt - 20   names  lt - c rep 1 nyear  rep 2 nyear  rep 3 nyear  rep 4 nyear                rep 5 nyear  rep 6 nyear  rep 7 nyear  rep 8 nyear     which works  but is clumsy  and obviously doesn t scale well   How do I repeat the N integers M times each in sequence    I tried nesting seq   and rep   but that didn t quite do what I wanted  I can obviously write a for-loop to do this  but there should be an intrinsic way to do this

User · Accepted Answer

You missed the each  argument to rep     R gt  n  lt - 3 R gt  rep 1 5  each n    1  1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 R gt     so your example can be done with a simple  R gt  rep 1 8  each 20

User · Answer

Another base R option could be gl     gl 5  3    Where the output is a factor     1  1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 Levels  1 2 3 4 5   If integers are needed  you can convert it   as numeric gl 5  3      1  1 1 1 2 2 2 3 3 3 4 4 4 5 5 5

User · Answer

For your example  Dirk s answer is perfect  If you instead had a data frame and wanted to add that sort of sequence as a column  you could also use group from groupdata2  disclaimer  my package  to greedily divide the datapoints into groups      Attach groupdata2 library groupdata2    Create a random data frame df  lt - data frame  x    rnorm 27     Create groups with 5 members each  except last group  group df  n   5  method    greedy            x  groups       lt dbl gt   lt fct gt     1  0 891  1        2 -1 13   1        3 -0 500  1        4 -1 12   1        5 -0 0187 1        6  0 420  2        7 -0 449  2        8  0 365  2        9  0 526  2       10  0 466  2             with 17 more rows   There s a whole range of methods for creating this kind of grouping factor  E g  by number of groups  a list of group sizes  or by having groups start when the value in some column differs from the value in the previous row  e g  if a column is c  x   x   y   z   z   the grouping factor would be c 1 1 2 3 3

[r] Create sequence of repeated values, in sequence?

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