all: put examples into a xxx_test package clause

Fixes gonum/gonum#1395.

floats/examples_test.go

@@ -2,9 +2,13 @@
 // Use of this code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package floats
+package floats_test
 
-import "fmt"
+import (
+	"fmt"
+
+	"gonum.org/v1/gonum/floats"
+)
 
 // Set of examples for all the functions
 
@@ -14,12 +18,13 @@ func ExampleAdd_simple() {
 	s1 := []float64{1, 2, 3, 4}
 	s2 := []float64{5, 6, 7, 8}
 	s3 := []float64{1, 1, 1, 1}
-	Add(s1, s2)
-	Add(s1, s3)
+	floats.Add(s1, s2)
+	floats.Add(s1, s3)
 
 	fmt.Println("s1 =", s1)
 	fmt.Println("s2 =", s2)
 	fmt.Println("s3 =", s3)
+
 	// Output:
 	// s1 = [7 9 11 13]
 	// s2 = [5 6 7 8]
@@ -34,13 +39,14 @@ func ExampleAdd_newslice() {
 	s3 := []float64{1, 1, 1, 1}
 	dst := make([]float64, len(s1))
 
-	AddTo(dst, s1, s2)
-	Add(dst, s3)
+	floats.AddTo(dst, s1, s2)
+	floats.Add(dst, s3)
 
 	fmt.Println("dst =", dst)
 	fmt.Println("s1 =", s1)
 	fmt.Println("s2 =", s2)
 	fmt.Println("s3 =", s3)
+
 	// Output:
 	// dst = [7 9 11 13]
 	// s1 = [1 2 3 4]
@@ -54,12 +60,13 @@ func ExampleAdd_unequallengths() {
 	s1 := []float64{1, 2, 3}
 	s2 := []float64{5, 6, 7, 8}
 
-	eq := EqualLengths(s1, s2)
+	eq := floats.EqualLengths(s1, s2)
 	if eq {
-		Add(s1, s2)
+		floats.Add(s1, s2)
 	} else {
 		fmt.Println("Unequal lengths")
 	}
+
 	// Output:
 	// Unequal lengths
 }
@@ -68,9 +75,10 @@ func ExampleAddConst() {
 	s := []float64{1, -2, 3, -4}
 	c := 5.0
 
-	AddConst(c, s)
+	floats.AddConst(c, s)
 
 	fmt.Println("s =", s)
+
 	// Output:
 	// s = [6 3 8 1]
 }
@@ -79,10 +87,11 @@ func ExampleCumProd() {
 	s := []float64{1, -2, 3, -4}
 	dst := make([]float64, len(s))
 
-	CumProd(dst, s)
+	floats.CumProd(dst, s)
 
 	fmt.Println("dst =", dst)
 	fmt.Println("s =", s)
+
 	// Output:
 	// dst = [1 -2 -6 24]
 	// s = [1 -2 3 -4]
@@ -92,10 +101,11 @@ func ExampleCumSum() {
 	s := []float64{1, -2, 3, -4}
 	dst := make([]float64, len(s))
 
-	CumSum(dst, s)
+	floats.CumSum(dst, s)
 
 	fmt.Println("dst =", dst)
 	fmt.Println("s =", s)
+
 	// Output:
 	// dst = [1 -1 2 -2]
 	// s = [1 -2 3 -4]