` ````
public class FisherTransform : IndicatorBase
{
public int Length = 9;
public decimal[] Fish { get; set; }
public decimal[] Trigger { get; set; }
decimal _maxHigh;
decimal _minLow;
private decimal _value1;
private decimal _lastValue1;
public FisherTransform(IEnumerable<Candle> candles, int length)
: base(candles)
{
Length = length;
RequiredCount = Length;
_lastValue1 = 1;
}
protected override void Initialize()
{
Fish = new decimal[Series.Length];
Trigger = new decimal[Series.Length];
}
public override void Compute(int startIndex = 1, int? endIndex = null)
{
if (endIndex == null)
endIndex = Series.Length;
for (int index = startIndex; index < endIndex; index++)
{
if (index == 1)
{
Fish[index - 1] = 1;
}
_minLow = Series.Average.Lowest(Length, index);
_maxHigh = Series.Average.Highest(Length, index);
_value1 = Maths.Normalize(0.66m * (Maths.Divide(Series.Average[index] - _minLow, Math.Max(_maxHigh - _minLow, 0.001m)) - 0.5m) + 0.67m * _lastValue1);
_lastValue1 = _value1;
Fish[index] = 0.5m * Maths.Log(Maths.Divide(1 + _value1, Math.Max(1 - _value1, .001m))) + 0.5m * Fish[index - 1];
Trigger[index] = Fish[index - 1];
}
}
}
```

Note, base page can be found here. Also, I only post these indicators once I have written unit tests against them. Please comment below if something doesn’t look right.