How to order a data frame by one descending and one ascending column

Question

I have a data frame  which looks like that        P1  P2  P3  T1  T2  T3  I1  I2 1   2   3   5   52  43  61  6    b  2   6   4   3   72  NA  59  1    a  3   1   5   6   55  48  60  6    f  4   2   4   4   65  64  58  2    b    I want to sort it by I1 in descending order  and rows with the same value in I1 by I2 in ascending order  getting the rows in the order 1 3 4 2  But the order function seems to only take one decreasing argument  which is then TRUE or FALSE for all ordering vectors at once  How do I get my sort correct

User · Answer

Simple one without rank      rum order rum I1  -rum I2  decreasing   TRUE

User · Answer

In  dudusan s example  you could also reverse the order of I1  and then sort ascending    gt  rum  lt - read table textConnection  P1  P2  P3  T1  T2  T3  I1  I2     2   3   5   52  43  61  6   b     6   4   3   72  NA  59  1   a     1   5   6   55  48  60  6   f     2   4   4   65  64  58  2   b     1   5   6   55  48  60  6   c    header   TRUE   gt  f factor rum I1      gt  levels f   lt - sort levels f   decreasing   TRUE   gt  rum order as character f   rum I2       P1 P2 P3 T1 T2 T3 I1 I2 1  2  3  5 52 43 61  6  b 5  1  5  6 55 48 60  6  c 3  1  5  6 55 48 60  6  f 4  2  4  4 65 64 58  2  b 2  6  4  3 72 NA 59  1  a  gt     This seems a bit shorter  you don t reverse the order of I2 twice

User · Answer

Let df be the data frame with 2 fields A and B Case 1  if your field A and B are numeric     df order df  1  df  2       - sorts fields A and B in ascending order      df order df  1  -df  2     - sorts fields A in ascending and B in descending order       priority is given to A        Case 2  if field A or B is non numeric say factor or character     In our case if B is character and we want to sort in reverse order     df order df  1  -as numeric as factor df  2       - gt  this sorts field A numerical  in ascending and field B character  in descending priority is given to A   The idea is that you can apply -sign in order function ony on numericals  So for sorting character strings in descending order you have to coerce them to numericals

User · Answer

The correct way is   rum order rum T1  rum T2  decreasing c T F

User · Answer

rum order rum T1  -rum T2

User · Answer

The default sort is stable  so we sort twice  First by the minor key  then by the major key  rum1  lt - rum order rum I2  decreasing   FALSE    rum2  lt - rum1 order rum1 I1  decreasing   TRUE

User · Answer

I m afraid Roman Lu  trik s answer is wrong  It works on this input by chance  Consider for example its output on a very similar input  with an additional line similar to the original line 3 with  c  in the I2 column    rum  lt - read table textConnection  P1  P2  P3  T1  T2  T3  I1  I2 2   3   5   52  43  61  6   b 6   4   3   72  NA  59  1   a 1   5   6   55  48  60  6   f 2   4   4   65  64  58  2   b 1   5   6   55  48  60  6   c    header   TRUE   rum I2  lt - as character rum I2  rum order rum I1  rev rum I2   decreasing   TRUE        P1 P2 P3 T1 T2 T3 I1 I2 3  1  5  6 55 48 60  6  f 1  2  3  5 52 43 61  6  b 5  1  5  6 55 48 60  6  c 4  2  4  4 65 64 58  2  b 2  6  4  3 72 NA 59  1  a   This is not the desired result  the first three values of I2 are f b c instead of b c f  which would be expected since the secondary sort is I2 in ascending order   To get the reverse order of I2  you want the large values to be small and vice versa  For numeric values multiplying by -1 will do it  but for characters its a bit more tricky  A general solution for characters strings would be to go through factors  reverse the levels  to make large values small and small values large  and change the factor back to characters    rum  lt - read table textConnection  P1  P2  P3  T1  T2  T3  I1  I2 2   3   5   52  43  61  6   b 6   4   3   72  NA  59  1   a 1   5   6   55  48  60  6   f 2   4   4   65  64  58  2   b 1   5   6   55  48  60  6   c    header   TRUE   f factor rum I2  levels f    rev levels f   rum order rum I1  as character f   decreasing   TRUE        P1 P2 P3 T1 T2 T3 I1 I2 1  2  3  5 52 43 61  6  b 5  1  5  6 55 48 60  6  c 3  1  5  6 55 48 60  6  f 4  2  4  4 65 64 58  2  b 2  6  4  3 72 NA 59  1  a

User · Answer

I use rank   rum  lt - read table textConnection  P1  P2  P3  T1  T2  T3  I1  I2 2   3   5   52  43  61  6   b 6   4   3   72  NA  59  1   a 1   5   6   55  48  60  6   f 2   4   4   65  64  58  2   b 1   5   6   55  48  60  6   c    header   TRUE    gt  rum order rum I1  -rank rum I2   decreasing   TRUE       P1 P2 P3 T1 T2 T3 I1 I2 1  2  3  5 52 43 61  6  b 5  1  5  6 55 48 60  6  c 3  1  5  6 55 48 60  6  f 4  2  4  4 65 64 58  2  b 2  6  4  3 72 NA 59  1  a

User · Answer

library dplyr      library tidyr       supposing you want to arrange column  c  in descending order and  d  in ascending order  name of data frame is df        first doing descending     df lt -arrange df desc c          then the ascending order of col  d      df  lt -arrange df d

User · Answer

I used this code to produce your desired output  Is this what you were after   rum  lt - read table textConnection  P1  P2  P3  T1  T2  T3  I1  I2 2   3   5   52  43  61  6   b 6   4   3   72  NA  59  1   a 1   5   6   55  48  60  6   f 2   4   4   65  64  58  2   b    header   TRUE  rum I2  lt - as character rum I2  rum order rum I1  rev rum I2   decreasing   TRUE        P1 P2 P3 T1 T2 T3 I1 I2 1  2  3  5 52 43 61  6  b 3  1  5  6 55 48 60  6  f 4  2  4  4 65 64 58  2  b 2  6  4  3 72 NA 59  1  a

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