# `Milvex.Ranker.DecayRanker`

Decay function reranker for hybrid search.

Applies a decay function (Gaussian, exponential, or linear) to a numeric field,
scoring documents higher when the field value is closer to the origin.
Useful for time-based relevance decay.

## Fields

  - `:function` - Decay curve: `:gauss`, `:exp`, or `:linear`
  - `:field` - Name of the numeric field to apply decay to
  - `:origin` - Center point (e.g., a timestamp)
  - `:scale` - Distance from origin at which score equals `:decay`
  - `:offset` - Zone around origin with full score (default: 0)
  - `:decay` - Score at `:scale` distance from origin (default: 0.5)

# `t`

```elixir
@type t() :: %Milvex.Ranker.DecayRanker{
  decay: float(),
  field: String.t(),
  function: :gauss | :exp | :linear,
  offset: non_neg_integer(),
  origin: integer(),
  scale: pos_integer()
}
```

---

*Consult [api-reference.md](api-reference.md) for complete listing*