Method: Polars::Expr#ewm_mean

Defined in:
lib/polars/expr.rb

#ewm_mean(com: nil, span: nil, half_life: nil, alpha: nil, adjust: true, min_periods: 1, ignore_nulls: true) ⇒ Expr

Exponentially-weighted moving average.

Examples:

df = Polars::DataFrame.new({"a" => [1, 2, 3]})
df.select(Polars.col("a").ewm_mean(com: 1))
# =>
# shape: (3, 1)
# ┌──────────┐
# │ a        │
# │ ---      │
# │ f64      │
# ╞══════════╡
# │ 1.0      │
# │ 1.666667 │
# │ 2.428571 │
# └──────────┘

Returns:

[View source]

6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
 
# File 'lib/polars/expr.rb', line 6519

def ewm_mean(
  com: nil,
  span: nil,
  half_life: nil,
  alpha: nil,
  adjust: true,
  min_periods: 1,
  ignore_nulls: true
)
  alpha = _prepare_alpha(com, span, half_life, alpha)
  _from_rbexpr(_rbexpr.ewm_mean(alpha, adjust, min_periods, ignore_nulls))
end