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Select column as Series at index location

Source code

Description

Select column as Series at index location

Usage

<DataFrame>$to_series(index = 0)

Arguments

index Index of the column to return as Series. Defaults to 0, which is the first column.

Value

Series or NULL

Examples

library("polars")

df <- as_polars_df(iris[1:10, ])

# default is to extract the first column
df$to_series()

#> shape: (10, 1)
#> ┌──────────────┐
#> │ Sepal.Length │
#> │ ---          │
#> │ f64          │
#> ╞══════════════╡
#> │ 5.1          │
#> │ 4.9          │
#> │ 4.7          │
#> │ 4.6          │
#> │ 5.0          │
#> │ 5.4          │
#> │ 4.6          │
#> │ 5.0          │
#> │ 4.4          │
#> │ 4.9          │
#> └──────────────┘

# Polars is 0-indexed, so we use index = 1 to extract the *2nd* column
df$to_series(index = 1)

#> shape: (10, 1)
#> ┌─────────────┐
#> │ Sepal.Width │
#> │ ---         │
#> │ f64         │
#> ╞═════════════╡
#> │ 3.5         │
#> │ 3.0         │
#> │ 3.2         │
#> │ 3.1         │
#> │ 3.6         │
#> │ 3.9         │
#> │ 3.4         │
#> │ 3.4         │
#> │ 2.9         │
#> │ 3.1         │
#> └─────────────┘