From a9135c535fabd3962237724044e8dcddcadce990 Mon Sep 17 00:00:00 2001
From: leo <wanderer@dotya.ml>
Date: Wed, 8 Feb 2023 01:14:33 +0100
Subject: [PATCH] cec2020: implement Hybrid3 func

---
 bench/cec2020/benchFunctions.go | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/bench/cec2020/benchFunctions.go b/bench/cec2020/benchFunctions.go
index 02836cf..5f9938f 100644
--- a/bench/cec2020/benchFunctions.go
+++ b/bench/cec2020/benchFunctions.go
@@ -156,7 +156,32 @@ func Hybrid2(x []float64) float64 {
 }
 
 // Hybrid3 is the "Hybrid Function 3" of CEC2020.
-func Hybrid3(x []float64) float64 { return 0 }
+func Hybrid3(x []float64) float64 {
+	nx := len(x)
+	fnx := float64(nx)
+
+	funcs := []func([]float64) float64{
+		SchafferExpanded,
+		HGBat,
+		Rosenbrock,
+		SchwefelModified,
+		HighConditionedElliptic,
+	}
+	// percentages used to control the amount of contribution of each func.
+	p := []float64{0.1, 0.2, 0.2, 0.2, 0.3}
+	gnx := getGnx(p, fnx)
+
+	z := newOpt(nx)
+	mz := getMz(x, z)
+
+	var sum float64
+
+	for i := range funcs {
+		sum += funcs[i](mz) * gnx[i]
+	}
+
+	return sum
+}
 
 // Composition1 is the "Composition Function 1" of CEC2020.
 func Composition1(x []float64) float64 { return 0 }