# Zero Lag Exponential Moving Average Envelope (ZLEMAENVELOPE)

> QuantNexus indicator page for a ZLEMA-based envelope.

**Route**: `/quantnexus/indicators/zlemaenvelope/`

## What It Does

ZLEMAENVELOPE surrounds the zero-lag exponential moving average with percentage bands.

## Formula

`Upper = ZLEMA(period) * (1 + perc / 100)` and `Lower = ZLEMA(period) * (1 - perc / 100)`

## Parameters

- `period` - default `30`
- `_movav` - default `EMA`
- `perc` - default `2.5`

## C++23 API

```cpp
#include <nonabt/indicators/zlemaenvelope.hpp>
auto zlemaEnvelope = std::make_unique<nonabt::ZLEMAENVELOPE>(data().close(), 30, "EMA", 2.5);
```

## Common Usage

- Use it to detect stretched moves around a reduced-lag average.
- Pair it with crossovers or pullback rules.
- Helpful when you want a faster envelope than SMA or EMA bands.