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points.go
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/
points.go
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package poly
import "fmt"
// A 2D point. Meant mostly for internal handling of the Interpolation
type Point struct {
x float64
y float64
}
func Build(x, y interface{}) *Point {
var X, Y float64
switch t1 := x.(type) {
case int:
X = float64(t1)
case float64:
X = t1
case float32:
X = float64(t1)
}
switch t2 := y.(type) {
case int:
Y = float64(t2)
case float64:
Y = t2
case float32:
Y = float64(t2)
}
return &Point{x: X, y: Y}
}
// Transforms 2 arrays into an array of points
func ToPoints(Xs, Ys []float64) ([]Point, error) {
var n int
var err error
if len(Xs)*len(Ys) == 0 {
return nil, fmt.Errorf("Contained an empty array")
}
if len(Xs) != len(Ys) {
n = len(Xs)
if len(Ys) < n {
n = len(Ys)
}
err = fmt.Errorf("Arrays of different size. Decided to take the first %d elements", n)
} else {
n = len(Xs)
}
arr := make([]Point, 0, n)
for i := 0; i < n; i++ {
arr = append(arr, Point{x: Xs[i],
y: Ys[i]})
}
return arr, err
}