go: improve plotting for GAs

* handle special cases
* extend title, description
* set custom x axis description

algo/de/jDE.go

@@ -155,6 +155,9 @@ func (j *JDE) Run() {
 			Dimens:      dim,
 			Iterations:  j.BenchMinIters,
 			Generations: maxFES,
+			NP:          j.NP,
+			F:           j.F,
+			CR:          j.CR,
 		}
 		funcStats := &stats.FuncStats{BenchName: j.BenchName}
 		dimXMean := &stats.BenchMean{

algo/plot.go

@@ -6,6 +6,7 @@ package algo
 import (
 	"fmt"
 	"log"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -23,7 +24,7 @@ import (
 const (
 	preferredFont      = "Mono"
 	titlePreferredFont = "Sans"
-	yAxisLabel         = "CF value"
+	yAxisLabel         = "f(x)"
 	xAxisLabel         = "Generations"
 )
 
@@ -246,6 +247,14 @@ func plotAllDims(algoStats []stats.Stats, fPrefix, fExt string, ch chan report.P
 			s.Generations,
 			s.Iterations,
 		)
+
+		// For differential evolution, add params to title.
+		if strings.Contains(s.Algo, "DE") {
+			p.Title.Text += fmt.Sprintf(",\nNP: %d, F: ", s.NP) +
+				strconv.FormatFloat(s.F, 'f', -1, 64) + ", CR: " +
+				strconv.FormatFloat(s.CR, 'f', -1, 64)
+		}
+
 		// this is latex-rendered.
 		pic.Caption = strings.ReplaceAll(p.Title.Text, " ", "~")
 
@@ -254,7 +263,12 @@ func plotAllDims(algoStats []stats.Stats, fPrefix, fExt string, ch chan report.P
 		pL.Bench = s.BenchFuncStats[0].BenchName
 		pLMean.Bench = s.BenchFuncStats[0].BenchName
 
+		if strings.Contains(s.Algo, "DE") {
+			p.X.Label.Text = "FES"
+		} else {
 			p.X.Label.Text = xAxisLabel
+		}
+
 		p.X.Label.TextStyle.Font.Variant = preferredFont
 		p.X.Label.TextStyle.Font.Weight = 1 // Medium
 		p.X.Tick.Label.Font.Variant = preferredFont
@@ -350,11 +364,15 @@ func plotAllDims(algoStats []stats.Stats, fPrefix, fExt string, ch chan report.P
 				filename, fExt, elapsed,
 			)
 
-			// TODO(me): rework this.
-			if s.Algo == "Random Search" {
+			switch {
+			case s.Algo == "Random Search":
 				printRandomSearch(info)
-			} else {
+
+			case strings.Contains(s.Algo, "Stochastic Hill Climbing"):
 				printSHC(info)
+
+			default:
+				log.Println(info)
 			}
 
 			// Save the plot to a file using the above-constructed 'filename'.

stats/stats.go

@@ -67,6 +67,13 @@ type Stats struct {
 	// comparing than algo generations, which can vary based on the type of
 	// algo, number of neighbours, etc..
 	Generations int
+	// NP is the initial population size, disable with 0. Only applicable to
+	// GAs (see algo/de for more details).
+	NP int
+	// F is the mutation factor, disable with 0. Only applicable to GAs.
+	F float64
+	// CR is the crossover probability, disable with 0. Only applicable to GAs.
+	CR float64
 }
 
 // Len implements the sort.Interface.