# SUPER TREND indicator by Olivier Seban coded for Amibroker (AFL)

Amibroker has many indicators and oscillators, but this useful and famous indicator by Olivier Seban called SUPER TREND is missing.

I coded the SUPER TREND indicator in afl for Amibroker and share with you the result.

```function SuperTrend( Periods, Multiplier )
{
AverageTrueRange = ATR( Periods );
MedianPrice = ( H + L ) / 2;

UpBand = MedianPrice + Multiplier * AverageTrueRange;
DnBand = MedianPrice - Multiplier * AverageTrueRange;

ST = Null;

Direction = 1;//just to initialize

for ( i = 1; i < BarCount; i++ )
{
// Begin Direction calculation
if ( Close[i] > UpBand[i-1] )
Direction[i] = 1;
else
if ( Close[i] < DnBand[i-1] )
Direction[i] = -1;
else
Direction[i] = Direction[i-1];
// End Direction calculation
// Begin SuperTrend calculation
if ( Direction[i] == 1 )
{
if ( DnBand[i-1] > DnBand[i] )
DnBand[i] = DnBand[i-1];

ST[i] = DnBand[i];
}
else
if ( Direction[i] == -1 )
{
if ( UpBand[i-1] < UpBand[i] )
UpBand[i] = UpBand[i-1];

ST[i] = UpBand[i];
}
// End SuperTrend calculation
}
return ST;
}
```

If you want to have a Super Trend Indicator charted with two colors like the one in the image above, you can read “How to color an indicator“.