Select & Drop

Select

(dataframe-select df names)

returns: a dataframe containing only the columns in the list names.

(dataframe-select* df name ...)

returns: a dataframe containing only the specified names (bare symbols, not a list).

> (define df (make-df* (a 1 2 3) (b 4 5 6) (c 7 8 9)))

> (dataframe-display (dataframe-select df '(a c)))

 dim: 3 rows x 2 cols
       a       c
   <num>   <num>
      1.      7.
      2.      8.
      3.      9.

> (dataframe-display (dataframe-select* df a c))

 dim: 3 rows x 2 cols
       a       c
   <num>   <num>
      1.      7.
      2.      8.
      3.      9.

---

Drop

(dataframe-drop df names)

returns: a dataframe with the columns in the list names removed.

(dataframe-drop* df name ...)

returns: a dataframe with the specified names removed (bare symbols, not a list).

> (dataframe-display (dataframe-drop df '(b)))

 dim: 3 rows x 2 cols
       a       c
   <num>   <num>
      1.      7.
      2.      8.
      3.      9.