Method: Polars::Expr#argsort

Defined in:

lib/polars/expr.rb

#argsort(reverse: false, nulls_last: false) ⇒ expr

Get the index values that would sort this column.

Alias for #arg_sort.

Examples:

df = Polars::DataFrame.new(
  {
    "a" => [20, 10, 30]
  }
)
df.select(Polars.col("a").argsort)
# =>
# shape: (3, 1)
# ┌─────┐
# │ a   │
# │ --- │
# │ u32 │
# ╞═════╡
# │ 1   │
# │ 0   │
# │ 2   │
# └─────┘

Parameters:

• reverse (Boolean) (defaults to: false) —

  Sort in reverse (descending) order.

• nulls_last (Boolean) (defaults to: false) —

  Place null values last instead of first.

Returns:

• (expr)

# File 'lib/polars/expr.rb', line 5765

def argsort(reverse: false, nulls_last: false)
  arg_sort(reverse: reverse, nulls_last: nulls_last)
end