migrate to math/rand/v2

go.mod

@@ -3,20 +3,17 @@ module gonum.org/v1/exp
 go 1.25.0
 
 require (
-	golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c
-	gonum.org/v1/gonum v0.15.1
-	gonum.org/v1/plot v0.15.1
+	gonum.org/v1/gonum v0.17.0
+	gonum.org/v1/plot v0.17.0
 )
 
 require (
-	codeberg.org/go-fonts/liberation v0.5.0 // indirect
-	codeberg.org/go-latex/latex v0.1.0 // indirect
-	codeberg.org/go-pdf/fpdf v0.10.0 // indirect
-	git.sr.ht/~sbinet/gg v0.6.0 // indirect
+	codeberg.org/go-fonts/liberation v0.6.0 // indirect
+	codeberg.org/go-latex/latex v0.3.0 // indirect
+	codeberg.org/go-pdf/fpdf v0.12.0 // indirect
+	git.sr.ht/~sbinet/gg v0.8.0 // indirect
 	github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b // indirect
-	github.com/campoy/embedmd v1.0.0 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/image v0.40.0 // indirect
 	golang.org/x/text v0.37.0 // indirect
 	golang.org/x/tools v0.45.0 // indirect

go.sum

@@ -1,35 +1,31 @@
 codeberg.org/go-fonts/dejavu v0.4.0 h1:2yn58Vkh4CFK3ipacWUAIE3XVBGNa0y1bc95Bmfx91I=
 codeberg.org/go-fonts/dejavu v0.4.0/go.mod h1:abni088lmhQJvso2Lsb7azCKzwkfcnttl6tL1UTWKzg=
-codeberg.org/go-fonts/latin-modern v0.4.0 h1:vkRCc1y3whKA7iL9Ep0fSGVuJfqjix0ica9UflHORO8=
-codeberg.org/go-fonts/latin-modern v0.4.0/go.mod h1:BF68mZznJ9QHn+hic9ks2DaFl4sR5YhfM6xTYaP9vNw=
-codeberg.org/go-fonts/liberation v0.5.0 h1:SsKoMO1v1OZmzkG2DY+7ZkCL9U+rrWI09niOLfQ5Bo0=
-codeberg.org/go-fonts/liberation v0.5.0/go.mod h1:zS/2e1354/mJ4pGzIIaEtm/59VFCFnYC7YV6YdGl5GU=
-codeberg.org/go-latex/latex v0.1.0 h1:hoGO86rIbWVyjtlDLzCqZPjNykpWQ9YuTZqAzPcfL3c=
-codeberg.org/go-latex/latex v0.1.0/go.mod h1:LA0q/AyWIYrqVd+A9Upkgsb+IqPcmSTKc9Dny04MHMw=
-codeberg.org/go-pdf/fpdf v0.10.0 h1:u+w669foDDx5Ds43mpiiayp40Ov6sZalgcPMDBcZRd4=
-codeberg.org/go-pdf/fpdf v0.10.0/go.mod h1:Y0DGRAdZ0OmnZPvjbMp/1bYxmIPxm0ws4tfoPOc4LjU=
+codeberg.org/go-fonts/latin-modern v0.5.0 h1:5vzaHjM+3uTRHhqQUuTZ/4FoVZkqXufyuKB9SdpLGp0=
+codeberg.org/go-fonts/latin-modern v0.5.0/go.mod h1:p8kFovLhQWuvorvlEjhjCp/3NZ06u7h23LvuLwQFK84=
+codeberg.org/go-fonts/liberation v0.6.0 h1:15Gh6SdwYve22CWCm9jYpVpRuaTh726av2TgHTHvAtQ=
+codeberg.org/go-fonts/liberation v0.6.0/go.mod h1:J15VAa+lyxdcI/Je7lDDDl6QOhLk9feNBnnwXqEHXOk=
+codeberg.org/go-latex/latex v0.3.0 h1:LKTaDHFbEC2PH1sh0sYv6PZ1pzs/g2aoeV1HItWj/bg=
+codeberg.org/go-latex/latex v0.3.0/go.mod h1:8ETijTpK2bFtwRAXLXe1RZJrYxnc5pibibZfQBj+Lk4=
+codeberg.org/go-pdf/fpdf v0.12.0 h1:g8E/1VqGqB2lZUUaqQrrTnA0IEJLPTTX1DZ0qS/ZmhU=
+codeberg.org/go-pdf/fpdf v0.12.0/go.mod h1:WJNJ2bvCj81rZBdhOf7lKOGoSl+OKMXcIcXqDcP8r5Y=
 git.sr.ht/~sbinet/cmpimg v0.1.0 h1:E0zPRk2muWuCqSKSVZIWsgtU9pjsw3eKHi8VmQeScxo=
 git.sr.ht/~sbinet/cmpimg v0.1.0/go.mod h1:FU12psLbF4TfNXkKH2ZZQ29crIqoiqTZmeQ7dkp/pxE=
-git.sr.ht/~sbinet/gg v0.6.0 h1:RIzgkizAk+9r7uPzf/VfbJHBMKUr0F5hRFxTUGMnt38=
-git.sr.ht/~sbinet/gg v0.6.0/go.mod h1:uucygbfC9wVPQIfrmwM2et0imr8L7KQWywX0xpFMm94=
+git.sr.ht/~sbinet/gg v0.8.0 h1:PjQ4AgUWRz7Dy6PVBKMLLg96eRCos1U+H6F3FJuKWHo=
+git.sr.ht/~sbinet/gg v0.8.0/go.mod h1:XhlGCvSXts+BaZ1XMZLxLSFUDvwsJ/2El5F6XzPep6o=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/ajstarks/deck v0.0.0-20200831202436-30c9fc6549a9/go.mod h1:JynElWSGnm/4RlzPXRlREEwqTHAN3T56Bv2ITsFT3gY=
 github.com/ajstarks/deck/generate v0.0.0-20210309230005-c3f852c02e19/go.mod h1:T13YZdzov6OU0A1+RfKZiZN9ca6VeKdBdyDV+BY97Tk=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b h1:slYM766cy2nI3BwyRiyQj/Ud48djTMtMebDqepE95rw=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b/go.mod h1:1KcenG0jGWcpt8ov532z81sp/kMMUG485J2InIOyADM=
-github.com/campoy/embedmd v1.0.0 h1:V4kI2qTJJLf4J29RzI/MAt2c3Bl4dQSYPuflzwFH2hY=
-github.com/campoy/embedmd v1.0.0/go.mod h1:oxyr9RCiSXg0M3VJ3ks0UGfp98BpSSGr0kpiX3MzVl8=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c h1:7dEasQXItcW1xKJ2+gg5VOiBnqWrJc+rq0DPKyvvdbY=
-golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c/go.mod h1:NQtJDoLvd6faHhE7m4T/1IY708gDefGGjR/iUW8yQQ8=
 golang.org/x/image v0.40.0 h1:Tw4GyDXMo+daZN1znreBRC3VayR1aLFUyUEOLUdW1a8=
 golang.org/x/image v0.40.0/go.mod h1:uIc348UZMSvS5Z65CVZ7iDPaNobNFEPeJ4kbqTOszmA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
@@ -54,10 +50,10 @@ golang.org/x/tools v0.45.0/go.mod h1:LuUGqqaXcXMEFEruIVJVm5mgDD8vww/z/SR1gQ4uE/0
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-gonum.org/v1/gonum v0.15.1 h1:FNy7N6OUZVUaWG9pTiD+jlhdQ3lMP+/LcTpJ6+a8sQ0=
-gonum.org/v1/gonum v0.15.1/go.mod h1:eZTZuRFrzu5pcyjN5wJhcIhnUdNijYxX1T2IcrOGY0o=
-gonum.org/v1/plot v0.15.1 h1:kASfUwe3GV6V1aLae8Ljhd+CcIG8XjeAC2CFGUwz0U4=
-gonum.org/v1/plot v0.15.1/go.mod h1:ionBLCeO4VrVHg93/wpkRqj/fkOckrb9p/4ePN7yRXE=
+gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
+gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
+gonum.org/v1/plot v0.17.0 h1:d0DwPVBe9jnEGqQBoZGl/P2M9WciJbG2CnV59C9QBT4=
+gonum.org/v1/plot v0.17.0/go.mod h1:ipt2GUN1oqzr2O7wCjLDtw1ShfIYYNBp4o0O1Ez5B3Y=
 honnef.co/go/tools v0.1.3/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
 rsc.io/pdf v0.1.1 h1:k1MczvYDUvJBe93bYd7wrZLLUEcLZAuF824/I4e5Xr4=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

linsolve/iterative_test.go

@@ -6,16 +6,15 @@ package linsolve
 
 import (
 	"math"
+	"math/rand/v2"
 	"testing"
 
-	"golang.org/x/exp/rand"
-
 	"gonum.org/v1/gonum/floats"
 	"gonum.org/v1/gonum/mat"
 )
 
 func TestDefaultMethodDefaultSettings(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,
@@ -44,7 +43,7 @@ func TestDefaultMethodDefaultSettings(t *testing.T) {
 }
 
 func TestCG(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	for _, tc := range testCases {
@@ -54,7 +53,7 @@ func TestCG(t *testing.T) {
 }
 
 func TestCGDefaultSettings(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	for _, tc := range testCases {
@@ -63,7 +62,7 @@ func TestCGDefaultSettings(t *testing.T) {
 }
 
 func TestBiCG(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,
@@ -91,7 +90,7 @@ func TestBiCG(t *testing.T) {
 }
 
 func TestBiCGDefaultSettings(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,
@@ -118,7 +117,7 @@ func TestBiCGDefaultSettings(t *testing.T) {
 }
 
 func TestBiCGStab(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,
@@ -139,7 +138,7 @@ func TestBiCGStab(t *testing.T) {
 }
 
 func TestBiCGStabDefaultSettings(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,
@@ -159,7 +158,7 @@ func TestBiCGStabDefaultSettings(t *testing.T) {
 }
 
 func TestGMRES(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,
@@ -189,7 +188,7 @@ func TestGMRES(t *testing.T) {
 }
 
 func TestGMRESDefaultSettings(t *testing.T) {
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	testCases := spdTestCases(rnd)
 	testCases = append(testCases,

linsolve/linsolve_test.go

@@ -7,8 +7,7 @@ package linsolve
 import (
 	"fmt"
 	"math"
-
-	"golang.org/x/exp/rand"
+	"math/rand/v2"
 
 	"gonum.org/v1/exp/linsolve/internal/triplet"
 	"gonum.org/v1/gonum/lapack/testlapack"
@@ -331,7 +330,7 @@ func newGreenbaum54(n1, n2 int, rnd *rand.Rand) testCase {
 	// Generate n2 real eigenvalues.
 	for i := 2 * n1; i < n; i++ {
 		r := 9*rnd.Float64() + 1
-		if rnd.Intn(2) == 0 {
+		if rnd.IntN(2) == 0 {
 			r *= -1
 		}
 		d[i*3+1] = r

linsolve/pde_example_test.go

@@ -7,8 +7,7 @@ package linsolve_test
 import (
 	"fmt"
 	"log"
-
-	"golang.org/x/exp/rand"
+	"math/rand/v2"
 
 	"gonum.org/v1/exp/linsolve"
 	"gonum.org/v1/gonum/mat"
@@ -230,7 +229,7 @@ func ExampleIterative_evolutionPDE() {
 		tau = 0.1 * L / nx
 		xi  = 6.0 * L / nx
 	)
-	rnd := rand.New(rand.NewSource(1))
+	rnd := rand.New(rand.NewPCG(1, 1))
 	ac := AllenCahnFD{
 		Xi: xi,
 		InitCond: func(x float64) float64 {

plotter/rings/axis_test.go

@@ -7,10 +7,9 @@ package rings
 import (
 	"fmt"
 	"image/color"
+	"math/rand/v2"
 	"testing"
 
-	"golang.org/x/exp/rand"
-
 	"gonum.org/v1/plot"
 	"gonum.org/v1/plot/font"
 	"gonum.org/v1/plot/font/liberation"
@@ -19,8 +18,8 @@ import (
 )
 
 func TestScoresAxis(t *testing.T) {
-	rand.Seed(1)
-	b, err := NewGappedBlocks(randomFeatures(3, 100000, 1000000, false, plotter.DefaultLineStyle),
+	rnd := rand.New(rand.NewPCG(1, 1))
+	b, err := NewGappedBlocks(randomFeatures(rnd, 3, 100000, 1000000, false, plotter.DefaultLineStyle),
 		Arc{0, Complete * Clockwise},
 		80, 100, 0.01,
 	)

plotter/rings/bezier.go

@@ -6,8 +6,7 @@ package rings
 
 import (
 	"math"
-
-	"golang.org/x/exp/rand"
+	"math/rand/v2"
 
 	"gonum.org/v1/plot/vg"
 )
@@ -72,6 +71,17 @@ type Bezier struct {
 	// If nil, these values are not used.
 	Crest  *FactorDist
 	Purity *FactorDist
+
+	// Src is a source of random numbers.
+	// If nil, the global one is used.
+	Src rand.Source
+}
+
+func (b *Bezier) f64() float64 {
+	if b.Src == nil {
+		return rand.Float64()
+	}
+	return rand.New(b.Src).Float64()
 }
 
 // ControlPoints returns a set of Bézier curve control points defining the path between the points defined
@@ -85,7 +95,7 @@ func (b *Bezier) ControlPoints(a [2]Angle, rad [2]vg.Length) []vg.Point {
 	var radius = b.Radius
 	if b.Purity != nil {
 		bisectRadius := vg.Length(math.Hypot(float64(p[0].X+p[1].X)/2, float64(p[0].Y+p[1].Y)/2))
-		radius.Length += vg.Length(b.Purity.Perturb(rand.Float64())-1) * (radius.Length - bisectRadius)
+		radius.Length += vg.Length(b.Purity.Perturb(b.f64())-1) * (radius.Length - bisectRadius)
 	}
 
 	var bisect Angle
@@ -94,11 +104,11 @@ func (b *Bezier) ControlPoints(a [2]Angle, rad [2]vg.Length) []vg.Point {
 	} else {
 		bisect = (a[1] + a[0]) / 2
 	}
-	mid := Rectangular(bisect, radius.Perturb(rand.Float64()))
+	mid := Rectangular(bisect, radius.Perturb(b.f64()))
 
 	if b.Crest != nil {
 		points := []vg.Point{0: p[0], 2: mid, 4: p[1]}
-		c := b.Crest.Perturb(rand.Float64())
+		c := b.Crest.Perturb(b.f64())
 
 		for i, r := range rad {
 			points[2*i+1] = Rectangular(a[i], r-(r-radius.Length)*vg.Length(c))

plotter/rings/blocks_test.go

@@ -7,10 +7,9 @@ package rings
 import (
 	"fmt"
 	"image/color"
+	"math/rand/v2"
 	"testing"
 
-	"golang.org/x/exp/rand"
-
 	"gonum.org/v1/plot"
 	"gonum.org/v1/plot/font"
 	"gonum.org/v1/plot/font/liberation"
@@ -21,8 +20,8 @@ import (
 
 func TestBlocks(t *testing.T) {
 	p := plot.New()
-	rand.Seed(1)
-	b, err := NewGappedBlocks(randomFeatures(3, 100000, 1000000, false, plotter.DefaultLineStyle),
+	rnd := rand.New(rand.NewPCG(1, 1))
+	b, err := NewGappedBlocks(randomFeatures(rnd, 3, 100000, 1000000, false, plotter.DefaultLineStyle),
 		Arc{0, Complete * Clockwise},
 		80, 100, 0.01,
 	)
@@ -39,8 +38,8 @@ func TestBlocks(t *testing.T) {
 }
 
 func TestBlocksScale(t *testing.T) {
-	rand.Seed(1)
-	b, err := NewGappedBlocks(randomFeatures(3, 100000, 1000000, false, plotter.DefaultLineStyle),
+	rnd := rand.New(rand.NewPCG(1, 1))
+	b, err := NewGappedBlocks(randomFeatures(rnd, 3, 100000, 1000000, false, plotter.DefaultLineStyle),
 		Arc{0, Complete * Clockwise},
 		80, 100, 0.01,
 	)

plotter/rings/example.go

@@ -11,10 +11,9 @@ import (
 	"flag"
 	"fmt"
 	"image/color"
+	"math/rand/v2"
 	"os"
 
-	"golang.org/x/exp/rand"
-
 	"gonum.org/v1/exp/plotter/rings"
 	"gonum.org/v1/plot"
 	"gonum.org/v1/plot/font"
@@ -43,7 +42,7 @@ func init() {
 func floatPtr(f float64) *float64 { return &f }
 
 func main() {
-	rand.Seed(0)
+	rnd := rand.New(rand.NewPCG(1, 1))
 
 	p := plot.New()
 	sty := plotter.DefaultLineStyle
@@ -55,7 +54,7 @@ func main() {
 
 	g := byte(0)
 	for i := vg.Length(0); i < 3; i++ {
-		bs, err := rings.NewGappedBlocks(randomFeatures(rand.Intn(10), 1000, 1000000, false, sty), rings.Arc{0, rings.Complete * rings.Clockwise}, 50+i*8, 55+i*8, 0.005)
+		bs, err := rings.NewGappedBlocks(randomFeatures(rnd, rnd.IntN(10), 1000, 1000000, false, sty), rings.Arc{0, rings.Complete * rings.Clockwise}, 50+i*8, 55+i*8, 0.005)
 		if err != nil {
 			panic(err)
 		}
@@ -64,7 +63,7 @@ func main() {
 		p.Add(bs)
 	}
 
-	bs, err := rings.NewGappedBlocks(randomFeatures(3, 100000, 1000000, false, sty), rings.Arc{0, rings.Complete * rings.Clockwise}, 80, 100, 0.01)
+	bs, err := rings.NewGappedBlocks(randomFeatures(rnd, 3, 100000, 1000000, false, sty), rings.Arc{0, rings.Complete * rings.Clockwise}, 80, 100, 0.01)
 	if err != nil {
 		panic(err)
 	}
@@ -86,7 +85,7 @@ func main() {
 	lb.TextStyle = draw.TextStyle{Color: color.Gray16{0}, Font: fnt.Font}
 	p.Add(lb)
 
-	m := randomFeatures(400, bs.Set[1].Start(), bs.Set[1].End(), true, sty)
+	m := randomFeatures(rnd, 400, bs.Set[1].Start(), bs.Set[1].End(), true, sty)
 	for _, mf := range m {
 		mf.(*fs).parent = bs.Set[1]
 	}
@@ -221,15 +220,15 @@ func lengthOf(f rings.Feature) float64 {
 	return f.End() - f.Start()
 }
 
-func randomFeatures(n int, min, max float64, single bool, sty draw.LineStyle) []rings.Feature {
+func randomFeatures(rnd *rand.Rand, n int, min, max float64, single bool, sty draw.LineStyle) []rings.Feature {
 	data := make([]rings.Feature, n)
 	for i := range data {
-		// Intn is used here to avoid drastic random
+		// IntN is used here to avoid drastic random
 		// sequence changes at this stage.
-		start := float64(rand.Intn(int(max-min))) + min
+		start := float64(rnd.IntN(int(max-min))) + min
 		var end float64
 		if !single {
-			end = float64(rand.Intn(int(max - start)))
+			end = float64(rnd.IntN(int(max - start)))
 		}
 		data[i] = &fs{
 			start: start,