Finding the index or unique values from a dataframe column

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I have a dataframe

TableName Function Argument
A         func1    3
B         func1    4
A         func2    6
B         func2    2
C         func1    5

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2021-01-22 07:17

Here is a dplyr solution where we create a variable with the row_number(), and use that as our index, i.e.

df %>% 
 mutate(new = row_number()) %>% 
 group_by(TableName) %>% 
 summarise(Index = toString(new))

which gives,

# A tibble: 3 x 2
  TableName Index
       
1 A         1, 3 
2 B         2, 4 
3 C         5

You can also save them as lists rather than strings, which will make future operations easier, i.e.

df %>% 
 mutate(new = row_number()) %>% 
 group_by(TableName) %>% 
 summarise(Index = list(new))

which gives,

# A tibble: 3 x 2
  TableName Index    
          
1 A         
2 B         
3 C

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