TRIX (Triple EMA Oscillator)

TRIX shows the percentage rate of change of a triple-smoothed EMA. The triple smoothing filters out minor price movements, making TRIX useful for identifying significant trend changes.

Declaration

function init(ctx) {
  ctx.indicator('trix', 'TRIX', { period: 15, source: 'close' });
}

Options

Option	Type	Default	Description
`period`	`number`	15	EMA period (applied three times)
`source`	`string`	`'close'`	Price source

Output

Returns a single number[] series oscillating around zero.

Accessing Values

function onBar(ctx, i) {
  const trix = ctx.ind.trix[i]; // Percentage value
}

Use Cases

Zero-Line Crossover

function onBar(ctx, i) {
  const trix = ctx.ind.trix[i];
  const prevTrix = ctx.ind.trix[i - 1];
  
  if (prevTrix <= 0 && trix > 0) {
    ctx.order.market('ASSET', 1, { signal: 'buy', reason: 'trix_bullish' });
  }
  if (prevTrix >= 0 && trix < 0) {
    ctx.order.close('ASSET', { signal: 'sell', reason: 'trix_bearish' });
  }
}

Calculation

$EMA_1 = EMA(Price, period)$
$EMA_2 = EMA(EMA_1, period)$
$EMA_3 = EMA(EMA_2, period)$
$TRIX = \frac{EMA_3[t] - EMA_3[t-1]}{EMA_3[t-1]} \times 100$

TEMA - Triple EMA value (not rate of change)
ROC - Rate of change of raw price
MACD - Dual EMA momentum indicator