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# Directional Movement Index (DMI)

## Description

An indicator developed by J. Welles Wilder for identifying when a definable trend is present in an instrument. That is, the DMI tells whether an instrument is trending or not.

...Courtesy of [FMLabs](http://www.fmlabs.com/reference/default.htm?url=DX.htm)

## Syntax

`DMI(int period)`

`DMI(ISeries\<double\> input, int period)`

**Returns default value**

`DMI(int period)[int barsAgo]`

`DMI(ISeries\<double\> input, int period)[int barsAgo]`

## Return Value

**double;** Accessing this method via an index value **\[int barsAgo]** returns the indicator value of the referenced bar.

## Parameters

| Parameter | Description                                                                                     |
| --------- | ----------------------------------------------------------------------------------------------- |
| input     | Indicator source data ([Series\<T>](/developer/desktop-sdk/references/common/iseriest/seriest)) |
| period    | Number of bars used in the calculation                                                          |

## Examples

```csharp
// Prints the current value of a 20 period DMI using default price type
double value = DMI(20)[0];
Print("The current DMI value is " + value.ToString());
```

## Source Code

You can view this indicator method source code by selecting the menu New > NinjaScript Editor > Indicators within the NinjaTrader Control Center window.