# Directional Indicator (DI)

> QuantNexus indicator page for DI.

**Route**: `/quantnexus/indicators/di/`

## What It Does

DI measures directional movement over time and is used as part of trend-strength analysis.

## Formula

DI is computed from smoothed directional movement and true range relationships.

## Parameters

- `period` - default `14`
- `movav` - default `SmoothedMovingAverage`

## C++23 API

```cpp
#include <nonabt/indicators/di.hpp>
auto di = std::make_unique<nonabt::DI>(data(), 14, "SmoothedMovingAverage");
```

## Common Usage

- Use DI as part of trend-strength filtering.
- Combine it with its opposite directional line.
- Useful in DMI and ADX-style systems.

## Practical Pattern

Rising DI values can indicate stronger directional pressure in the current trend.