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lib/oscillators/trendflex/Trendflex.md
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# TRENDFLEX: Ehlers Trendflex Indicator
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Oscillator |
| **Inputs** | Source (close) |
| **Parameters** | `period` |
| **Outputs** | Single series (Trendflex) |
| **Output range** | Varies (see docs) |
| **Warmup** | `period` bars |
### TL;DR
- The Trendflex indicator combines a 2-pole Butterworth low-pass pre-filter (Super Smoother) with an O(1) cumulative slope measurement and exponentia...
- Parameterized by `period`.
- Output range: Varies (see docs).
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "The trend is your friend until it bends." — Ed Seykota, but Ehlers actually measures the bending.
## Introduction