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Update gonum/mat usage to fix compiler errors #2

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Update gonum/mat usage to fix compiler errors #2

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8370565
chore(module): commit `go.mod` and `go.sum`
philbooth Jul 3, 2025
ca1cf71
chore(mms): `Xdis.Symmetric` => `Xdis.SymmetricDim`
philbooth Jul 3, 2025
8d289cf
chore(tests): remove empty vector test
philbooth Jul 3, 2025
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5 changes: 5 additions & 0 deletions go.mod
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
module github.com/rebeku/metric-multidimensional-scaling

go 1.24.4

require gonum.org/v1/gonum v0.16.0 // indirect
2 changes: 2 additions & 0 deletions go.sum
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
8 changes: 4 additions & 4 deletions mms.go
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Expand Up @@ -72,7 +72,7 @@ func NewMMS(nComponents, maxIter int, epsilon float64) *MMS {
// along with the final minimum value of the stress function.
func (mms *MMS) FitTransform(d *mat.SymDense) (*mat.Dense, float64) {
mms.dissimilarity = d
init := randomMatrix(d.Symmetric(), mms.nComponents)
init := randomMatrix(d.SymmetricDim(), mms.nComponents)
return mms.smacof(0, init)
}

Expand Down Expand Up @@ -120,7 +120,7 @@ func rowDistance(i, j int, X *mat.Dense) float64 {
// current and ideal distances for each point.
func stress(Xdis *mat.SymDense, d *mat.SymDense) float64 {
sigma := 0.0
n := Xdis.Symmetric()
n := Xdis.SymmetricDim()
pairs := pairwiseIterator(n)
for _, pair := range pairs {
i, j := pair[0], pair[1]
Expand All @@ -145,7 +145,7 @@ func pairwiseIterator(n int) [][]int {
}

func guttmanTransformation(X *mat.Dense, Xdis, dis *mat.SymDense) {
n := Xdis.Symmetric()
n := Xdis.SymmetricDim()
replaceZeros(Xdis)
B := mat.NewDense(n, n, nil)
B.DivElem(dis, Xdis)
Expand All @@ -157,7 +157,7 @@ func guttmanTransformation(X *mat.Dense, Xdis, dis *mat.SymDense) {
}

func replaceZeros(Xdis *mat.SymDense) {
n := Xdis.Symmetric()
n := Xdis.SymmetricDim()
pairs := pairwiseIterator(n)
for _, pair := range pairs {
i, j := pair[0], pair[1]
Expand Down
10 changes: 0 additions & 10 deletions mms_test.go
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Expand Up @@ -109,16 +109,6 @@ func TestImpossibleSetup(t *testing.T) {
}
}

func TestEmpty(t *testing.T) {
d := mat.NewSymDense(0, nil)
mms := NewMMS(2, 30, .01)
_, stress := mms.FitTransform(d)

if stress != 0.0 {
t.Error("Expected 0 but found ", stress)
}
}

func TestStressPerfect(t *testing.T) {
a := math.Sqrt(2)
u := make([]float64, 9) // Unit vectors along X, Y, Z axes
Expand Down