feat: add new indicators (Decay, Edecay, MinusDi, MinusDm, PlusDi, PlusDm, Maxindex, Minindex, Sarext) and update pine scripts, core libs, validation tests, and python bindings

lib/cycles/eacp/Eacp.Validation.Tests.cs

@@ -418,5 +418,33 @@ public class EacpValidationTests
         Assert.True(diff > 5, $"Should detect different cycles: {eacp1.DominantCycle} vs {eacp2.DominantCycle}");
     }
 
+    [Fact]
+    public void Eacp_Correction_Recomputes()
+    {
+        var ind = new Eacp(8, 48, 3, true);
+        var t0 = new DateTime(946_684_800_000_000_0L, DateTimeKind.Utc);
+
+        // Build state well past warmup
+        for (int i = 0; i < 100; i++)
+        {
+            ind.Update(new TValue(t0.AddMinutes(i),
+                100.0 + 10.0 * Math.Sin(2.0 * Math.PI * i / 20.0)), isNew: true);
+        }
+
+        // Anchor bar
+        var anchorTime = t0.AddMinutes(100);
+        const double anchorPrice = 105.5;
+        ind.Update(new TValue(anchorTime, anchorPrice), isNew: true);
+        double anchorResult = ind.Last.Value;
+
+        // Correction with a dramatically different price — recompute must yield different result
+        ind.Update(new TValue(anchorTime, anchorPrice * 10.0), isNew: false);
+        Assert.NotEqual(anchorResult, ind.Last.Value);
+
+        // Correction back to original price — must exactly restore original result
+        ind.Update(new TValue(anchorTime, anchorPrice), isNew: false);
+        Assert.Equal(anchorResult, ind.Last.Value, Tolerance);
+    }
+
     #endregion
 }

lib/cycles/eacp/Eacp.cs

@@ -48,6 +48,7 @@ public sealed class Eacp : AbstractBase
     private readonly double[] _corr;
     private readonly double[] _power;
     private readonly double[] _smooth;
+    private readonly double[] _p_smooth;
 
     // State for filters and output
     [StructLayout(LayoutKind.Auto)]
@@ -122,6 +123,7 @@ public sealed class Eacp : AbstractBase
         _corr = new double[size];
         _power = new double[size];
         _smooth = new double[size];
+        _p_smooth = new double[size];
         _filtHistory = new RingBuffer(size + maxPeriod);
 
         Name = $"Eacp({minPeriod},{maxPeriod})";
@@ -156,11 +158,13 @@ public sealed class Eacp : AbstractBase
         {
             _ps = _s;
             _filtHistory.Snapshot();
+            Array.Copy(_smooth, _p_smooth, _smooth.Length);
         }
         else
         {
             _s = _ps;
             _filtHistory.Restore();
+            Array.Copy(_p_smooth, _smooth, _smooth.Length);
         }
 
         var s = _s;
@@ -407,6 +411,7 @@ public sealed class Eacp : AbstractBase
         Array.Clear(_corr);
         Array.Clear(_power);
         Array.Clear(_smooth);
+        Array.Clear(_p_smooth);
         Last = default;
     }
 
@@ -414,7 +419,7 @@ public sealed class Eacp : AbstractBase
     {
         foreach (double value in source)
         {
-            Update(new TValue(DateTime.UtcNow, value));
+            Update(new TValue(DateTime.MinValue, value));
         }
     }
 
@@ -459,7 +464,7 @@ public sealed class Eacp : AbstractBase
         var eacp = new Eacp(minPeriod, maxPeriod, avgLength, enhance);
         for (int i = 0; i < len; i++)
         {
-            var result = eacp.Update(new TValue(DateTime.UtcNow, source[i]));
+            var result = eacp.Update(new TValue(DateTime.MinValue, source[i]));
             output[i] = result.Value;
         }
     }

lib/cycles/eacp/eacp.pine

@@ -1,4 +1,4 @@
-// The MIT License (MIT)
+// Licensed under the Apache License, Version 2.0
 // © mihakralj
 //@version=6
 indicator("Ehlers Autocorrelation Periodogram (EACP)","EACP",overlay=false)