Method: Polars::StringExpr#to_decimal

Defined in:
lib/polars/string_expr.rb

#to_decimal(scale:) ⇒ Expr

Convert a String column into a Decimal column.

Examples:

df = Polars::DataFrame.new(
  {
    "numbers": [
      "40.12",
      "3420.13",
      "120134.19",
      "3212.98",
      "12.90",
      "143.09",
      "143.9"
    ]
  }
)
df.with_columns(numbers_decimal: Polars.col("numbers").str.to_decimal(scale: 2))
# =>
# shape: (7, 2)
# ┌───────────┬─────────────────┐
# │ numbers   ┆ numbers_decimal │
# │ ---       ┆ ---             │
# │ str       ┆ decimal[38,2]   │
# ╞═══════════╪═════════════════╡
# │ 40.12     ┆ 40.12           │
# │ 3420.13   ┆ 3420.13         │
# │ 120134.19 ┆ 120134.19       │
# │ 3212.98   ┆ 3212.98         │
# │ 12.90     ┆ 12.90           │
# │ 143.09    ┆ 143.09          │
# │ 143.9     ┆ 143.90          │
# └───────────┴─────────────────┘

Parameters:

  • scale (Integer) —

    Number of digits after the comma to use for the decimals.

Returns:



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# File 'lib/polars/string_expr.rb', line 279

def to_decimal(scale:)
  Utils.wrap_expr(_rbexpr.str_to_decimal(scale))
end