Get column by index
Description
Extract a DataFrame column (by index) as a Polars series. Unlike
get_column(), this method will not fail but will return a
NULL if the index doesn’t exist in the DataFrame. Keep in
mind that Polars is 0-indexed so "0" is the first column.
Usage
<DataFrame>$to_series(idx = 0)
Arguments
idx
|
Index of the column to return as Series. Defaults to 0, which is the first column. |
Value
Series or NULL
Examples
library(polars)
df = pl$DataFrame(iris[1:10, ])
# default is to extract the first column
df$to_series()
#> polars Series: shape: (10,)
#> Series: 'Sepal.Length' [f64]
#> [
#> 5.1
#> 4.9
#> 4.7
#> 4.6
#> 5.0
#> 5.4
#> 4.6
#> 5.0
#> 4.4
#> 4.9
#> ]
#> polars Series: shape: (10,)
#> Series: 'Sepal.Width' [f64]
#> [
#> 3.5
#> 3.0
#> 3.2
#> 3.1
#> 3.6
#> 3.9
#> 3.4
#> 3.4
#> 2.9
#> 3.1
#> ]
#> NULL