Bisection Method Sample

bisectionMethod.go

package main

import (
	"fmt"
	"math"
)

func main() {
	a := 1.0
	b := 2.0
	c := 1.5

	for math.Abs(calc(c)) > 0.00001 {
		c = (a + b) / 2.0
		fa := calc(a)
		// fb := calc(b)
		fc := calc(c)

		// 符号チェック
		if fa*fc > 0 {
			a = c
		} else {
			b = c
		}
	}

	fmt.Println(c)
	fmt.Println(calc(c))
}

func calc(x float64) float64 {
	return x*x - 2
}