select

Builtin index · Collections & strings

result = select(df, "col", ...)

Input: df, "col", ... · Output: result

What it is

df is a Table; each remaining argument is a Str column name.

Overloads

One call shape — this function is not overloaded.

Code	Input	Output	Description
`result = select(df, "col", ...)`	`df` Table`df` is a `Table`. `"col"` —not documented yet `...` repeatablenot documented yet	`result` Table	Returns a `Table` containing only the named columns, in the order given.

Examples

From the documentation, and run by the build -- the output and the figure below are what the engine actually produced. Simplest first.

df = DataFrame(x=[1, 2, 3, 4, 5], y=[10, 20, 30, 40, 50], label="sample")
print(nrow(df))            # 5

print(ncol(df))             # 3

tall = filter(df, df.x > 2)
xy = select(tall, "x", "y")
print(xy)
print(describe(df))

output

5
3
x   y
-  --
3  30
4  40
5  50
stat          x          y
-----  --------  ---------
count         5          5
mean          3         30
std    1.581139  15.811388
min           1         10
25%           2         20
    ... 3 more lines

from collections-strings