Method: Polars::Expr#arg_unique

Defined in:

lib/polars/expr.rb

#arg_unique ⇒ Expr

Get index of first unique value.

Examples:

df = Polars::DataFrame.new(
  {
    "a" => [8, 9, 10],
    "b" => [nil, 4, 4]
  }
)
df.select(Polars.col("a").arg_unique)
# =>
# shape: (3, 1)
# ┌─────┐
# │ a   │
# │ --- │
# │ u32 │
# ╞═════╡
# │ 0   │
# │ 1   │
# │ 2   │
# └─────┘

df.select(Polars.col("b").arg_unique)
# =>
# shape: (2, 1)
# ┌─────┐
# │ b   │
# │ --- │
# │ u32 │
# ╞═════╡
# │ 0   │
# │ 1   │
# └─────┘

Returns:

• (Expr)

# File 'lib/polars/expr.rb', line 2253

def arg_unique
  _from_rbexpr(_rbexpr.arg_unique)
end