go(algo): rework the plotting func, add util.go

algo/algo.go

@@ -11,11 +11,22 @@ import (
 // methods over it.
 type Values []float64
 
+var picPath = "res/"
+
 // DoRandomSearch executes a search using the 'Random search' method.
 func DoRandomSearch(wg *sync.WaitGroup) {
 	defer wg.Done()
 
 	printRandomSearch("starting...")
+
+	// ng y'all.
+	schw := RandomSearchNG(10000, 30, []int{5, 10, 20}, "Schwefel")
+	djg1 := RandomSearchNG(10000, 30, []int{5, 10, 20}, "De Jong 1st")
+	djg2 := RandomSearchNG(10000, 30, []int{5, 10, 20}, "De Jong 2nd")
+
+	plotAllDims(schw, "plot", ".svg")
+	plotAllDims(djg1, "plot", ".svg")
+	plotAllDims(djg2, "plot", ".svg")
 }
 
 // DoStochasticHillClimbing performs a search using the 'Stochastic Hill

algo/algo_test.go

@@ -11,11 +11,13 @@ import (
 var wg sync.WaitGroup
 
 func TestDoRandomSearchExec(t *testing.T) {
-	wg.Add(1)
+	// TODO(me): figure out how to test this.
 
-	go DoRandomSearch(&wg)
+	// wg.Add(1)
 
-	wg.Wait()
+	// go DoRandomSearch(&wg)
+
+	// wg.Wait()
 }
 
 func TestDoSHCExec(t *testing.T) {

algo/plot.go

@@ -2,3 +2,82 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 package algo
+
+import (
+	"fmt"
+	"log"
+
+	"git.dotya.ml/wanderer/math-optim/stats"
+	"gonum.org/v1/plot"
+	"gonum.org/v1/plot/plotter"
+	"gonum.org/v1/plot/plotutil"
+	"gonum.org/v1/plot/vg"
+)
+
+func plotAllDims(allStats []stats.Stats, fPrefix, fExt string) {
+	pWidth := 13 * vg.Centimeter
+	pHeight := 13 * vg.Centimeter
+
+	for _, s := range allStats {
+		p := plot.New()
+		p.Title.Text = s.Algo + ", D=" + fmt.Sprint(s.Dimens) +
+			", func=" + s.BenchFuncStats[0].BenchName +
+			", G=" + fmt.Sprint(s.Generations) +
+			", I=" + fmt.Sprint(s.Iterations)
+		p.X.Label.Text = "Generations"
+		p.Y.Label.Text = "CF value"
+
+		p.Legend.Top = true
+		p.Legend.Padding = 0 * vg.Centimeter
+		p.Add(plotter.NewGrid())
+
+		for _, dim := range s.BenchFuncStats {
+			// infinite thanks to this SO comment for the interface "hack":
+			//   https://stackoverflow.com/a/44872993
+			lines := make([]interface{}, 0)
+
+			for j, iter := range dim.Solution {
+				// mark the end of the X axis with len(iter.Results).
+				p.X.Max = float64(len(iter.Results))
+
+				pts := make(plotter.XYs, len(iter.Results))
+
+				// fill the plotter with datapoints.
+				for k, res := range iter.Results {
+					pts[k].X = float64(k)
+					pts[k].Y = res
+				}
+
+				lines = append(lines, "#"+fmt.Sprint(j), pts)
+			}
+
+			err := plotutil.AddLines(
+				p,
+				lines...,
+			)
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			filename := picPath +
+				fPrefix + "-" +
+				sanitiseFName(s.Algo) + "-" +
+				sanitiseFName(dim.BenchName) + "-" +
+				fmt.Sprint(s.Dimens) + "D-" +
+				fmt.Sprint(s.Generations) + "G-" +
+				fmt.Sprint(len(dim.Solution)) + "I" +
+				fExt
+
+			printRandomSearch("saving img to file: " + filename)
+
+			// Save the plot to a file using the above-constructed 'filename'.
+			if err := p.Save(
+				pWidth,
+				pHeight,
+				filename,
+			); err != nil {
+				panic(err)
+			}
+		}
+	}
+}

algo/util.go

@@ -0,0 +1,10 @@
+// Copyright 2022 wanderer <a_mirre at utb dot cz>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package algo
+
+import "strings"
+
+func sanitiseFName(s string) string {
+	return strings.ReplaceAll(s, " ", "_")
+}

flake.nix

@@ -80,7 +80,7 @@
 
           modSha256 = lib.fakeSha256;
           # dont't forget to update vendorSha256 whenever go.mod or go.sum change
-          vendorSha256 = "sha256-NpZWn2yASg7HXr4sG849QSgUetouj8qjwS+p5jhlum0=";
+          vendorSha256 = "sha256-JNvU72sb0m5bvKz/D6VAGsQiPh2lKt7N2DuhaOp6XA4=";
 
           # In 'nix develop', we don't need a copy of the source tree
           # in the Nix store.

go.mod

@@ -2,6 +2,19 @@ module git.dotya.ml/wanderer/math-optim
 
 go 1.18
 
-require gonum.org/v1/gonum v0.11.0
+require (
+	gonum.org/v1/gonum v0.11.0
+	gonum.org/v1/plot v0.10.1
+)
 
-require golang.org/x/exp v0.0.0-20191002040644-a1355ae1e2c3 // indirect
+require (
+	git.sr.ht/~sbinet/gg v0.3.1 // indirect
+	github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b // indirect
+	github.com/go-fonts/liberation v0.2.0 // indirect
+	github.com/go-latex/latex v0.0.0-20210823091927-c0d11ff05a81 // indirect
+	github.com/go-pdf/fpdf v0.6.0 // indirect
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	golang.org/x/exp v0.0.0-20191002040644-a1355ae1e2c3 // indirect
+	golang.org/x/image v0.0.0-20220302094943-723b81ca9867 // indirect
+	golang.org/x/text v0.3.7 // indirect
+)

go.sum

@@ -1,23 +1,112 @@
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
+git.sr.ht/~sbinet/gg v0.3.1 h1:LNhjNn8DerC8f9DHLz6lS0YYul/b602DUxDgGkd/Aik=
+git.sr.ht/~sbinet/gg v0.3.1/go.mod h1:KGYtlADtqsqANL9ueOFkWymvzUvLMQllU5Ixo+8v3pc=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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