# TRIX

`trix`

The one-bar change of a triple smoothed EMA.

## Inputs

| Name | Type | Default | Range |
| --- | --- | --- | --- |
| source | source | close |  |
| period | int | 14 | 1 to 5000 |

## Outputs

| Name | Kind |
| --- | --- |
| trix | value |

Warm-up: max(3 * period - 3, 1) bars (39 at the defaults).

Repaints: No.

## Formula

E1 = EMA(source, period), E2 = EMA(E1, period), E3 = EMA(E2, period)

TRIX = (E3[i] - E3[i-1]) / E3[i-1], a fraction and not a percent

E2 starts at bar period - 1 and E3 at bar 2 * (period - 1).