# tripleExponentialDerivative() function

The `tripleExponentialDerivative()` function calculates a triple exponential derivative (TRIX of input tables using `n` points.

Function type: Aggregate

``````tripleExponentialDerivative(n: 5)
``````

Triple exponential derivative, commonly referred to as “TRIX,” is a momentum indicator and oscillator. A triple exponential derivative uses the natural logarithm (log) of input data to calculate a triple exponential moving average over the period of time. The calculation prevents cycles shorter than the defined period from being considered by the indicator. `tripleExponentialDerivative()` uses the time between `n` points to define the period.

Triple exponential derivative oscillates around a zero line. A positive momentum oscillator value indicates an overbought market; a negative value indicates an oversold market. A positive momentum indicator value indicates increasing momentum; a negative value indicates decreasing momentum.

##### Triple exponential moving average rules
• A triple exponential derivative is defined as:
• `TRIX[i] = ((EMA3[i] / EMA3[i - 1]) - 1) * 100`:
• `EMA_3 = EMA(EMA(EMA(data)))`
• If there are not enough values to calculate a triple exponential derivative, the output `_value` is `NaN`; all other columns are the same as the last record of the input table.
• The function behaves the same way as the `exponentialMovingAverage()` function:
• The function does not include `null` values in the calculation.
• The function acts only on the `_value` column.

## Parameters

### n

The number of points to use in the calculation.

Data type: Integer

## Examples

#### Calculate a five point triple exponential derivative

``````from(bucket: "telegraf/autogen"):
|> range(start: -12h)
|> tripleExponentialDerivative(n: 5)
``````

TRIPLE_EXPONENTIAL_DERIVATIVE

This documentation is open source. See a typo? Please, open an issue.

Need help getting up and running? Get Support