gonum.org/v1/gonum v0.17.0: floats.Dot

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/gonum.org/v1/gonum@v0.17.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/gonum.org/v1/gonum@v0.17.0
Demonstrate these symbols/APIs:
  - gonum.org/v1/gonum/floats.Dot

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:d95f422deba788f2c2102ff61715715b0e8d2b75e721568af1dc692657df11f7","contract":["floats.Dot calculates the dot product of two float64 slices","floats.Dot returns zero for orthogonal float64 slices","floats.Dot returns zero for empty float64 slices","floats.Dot panics when the lengths of the slices do not match"],"goal":"verify pkg:golang/gonum.org/v1/gonum@v0.17.0","kind":"HOW","packages":["pkg:golang/gonum.org/v1/gonum@v0.17.0"],"schemaVersion":1,"symbols":["gonum.org/v1/gonum/floats.Dot"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/gonum.org/v1/gonum@v0.17.0"],"schemaVersion":1,"subject":"pkg:golang/gonum.org/v1/gonum@v0.17.0","symbols":["gonum.org/v1/gonum/floats.Dot"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require gonum.org/v1/gonum v0.17.0

gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=

package main

import (
	"fmt"

	"gonum.org/v1/gonum/floats"
)

func main() {
	v1 := []float64{1.0, 3.0, -5.0}
	v2 := []float64{4.0, -2.0, -1.0}

	dot := floats.Dot(v1, v2)
	fmt.Printf("v1 . v2 = %.2f\n", dot)

	ortho1 := []float64{1.0, 0.0}
	ortho2 := []float64{0.0, 1.0}
	fmt.Printf("ortho1 . ortho2 = %.2f\n", floats.Dot(ortho1, ortho2))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/gonum.org/v1/gonum@v0.17.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/gonum.org/v1/gonum@v0.17.0"
  ],
  "symbols": [
    "gonum.org/v1/gonum/floats.Dot"
  ]
}

package main

import (
	"fmt"
	"math"
	"os"

	"gonum.org/v1/gonum/floats"
)

func main() {
	// Assertion 1: floats.Dot calculates the dot product of two float64 slices
	v1 := []float64{1.0, 3.0, -5.0}
	v2 := []float64{4.0, -2.0, -1.0}
	dot := floats.Dot(v1, v2)
	expectedDot := 3.0
	if math.Abs(dot-expectedDot) > 1e-9 {
		fmt.Fprintf(os.Stderr, "FAIL: floats.Dot mismatch: got %f, want %f\n", dot, expectedDot)
		os.Exit(1)
	}

	// Assertion 2: floats.Dot returns zero for orthogonal float64 slices
	ortho1 := []float64{1.0, 0.0}
	ortho2 := []float64{0.0, 1.0}
	orthoDot := floats.Dot(ortho1, ortho2)
	if math.Abs(orthoDot) > 1e-9 {
		fmt.Fprintf(os.Stderr, "FAIL: floats.Dot orthogonal mismatch: got %f, want 0.0\n", orthoDot)
		os.Exit(1)
	}

	// Assertion 3: floats.Dot returns zero for empty float64 slices
	empty1 := []float64{}
	empty2 := []float64{}
	emptyDot := floats.Dot(empty1, empty2)
	if math.Abs(emptyDot) > 1e-9 {
		fmt.Fprintf(os.Stderr, "FAIL: floats.Dot empty slices mismatch: got %f, want 0.0\n", emptyDot)
		os.Exit(1)
	}

	// Assertion 4: floats.Dot panics when the lengths of the slices do not match
	panicked := false
	func() {
		defer func() {
			if r := recover(); r != nil {
				panicked = true
			}
		}()
		floats.Dot([]float64{1.0, 2.0}, []float64{1.0})
	}()
	if !panicked {
		fmt.Fprintf(os.Stderr, "FAIL: floats.Dot did not panic on mismatched slice lengths\n")
		os.Exit(1)
	}

	fmt.Println("All gonum floats contract assertions passed.")
}