角度平均を求めるプログラム(-180.0 ~ 180.0)

Angle_average.java

// 構造体使用ver
import java.lang.Math;

public class Angle_average{

    public static void main(String[] args){

        final class vector{
            double x;
            double y;
        }

        System.out.println("角度の平均");

        // 変数宣言・初期化
        double ang_avg;

        // -----ここに平均を求めたい角度を入力-----
        double[] angles = {350.0, 20.0};

        int len = angles.length;

        double[] angles_rad = new double[len];

        vector[] vectors = new vector[len];

        vector vector_avg = new vector();

        for (int i = 0; i < vectors.length; i++) {
            vectors[i] = new vector();
        }

        for (int i = 0; i < angles.length; i++) {
            //angles_rad[i] = angles[i] * (Math.PI / 180.0);
            angles_rad[i] = Math.toRadians(angles[i]);

            vectors[i].x = Math.cos(angles_rad[i]);
            vectors[i].y = Math.sin(angles_rad[i]);
        }

        // 平均を求める
        vector_avg.x = 0.0;
        vector_avg.y = 0.0;

        for (int i = 0; i < vectors.length; i++) {
            vector_avg.x += vectors[i].x;
            vector_avg.y += vectors[i].y;
        }

        vector_avg.x = vector_avg.x / (double)vectors.length;
        vector_avg.y = vector_avg.y / (double)vectors.length;
        
        // ベクトルから角度に変換
        ang_avg = Math.atan2(vector_avg.y, vector_avg.x);

        // 計算誤差の補正
        if(Math.abs(ang_avg) < Math.pow(10, -8)){
            ang_avg = 0.0;
        }

        System.out.println(Double.toString(Math.toDegrees(ang_avg)) + "\n");
    }
}

Angle_average_ver2.java

// 構造体未使用ver

import java.lang.Math;

public class Angle_average_back{

    public static void main(String[] args){

        System.out.println("角度の平均");

        // 変数宣言・初期化
        double ang_avg;

        // -----ここに平均を求めたい角度を入力-----
        double[] angles = {10.0, 350.0};

        int len = angles.length;

        double[] angles_rad = new double[len];

        double[] vectors_x = new double[len];
        double[] vectors_y = new double[len];

        double vector_avg_x = 0.0;
        double vector_avg_y = 0.0;

        for (int i = 0; i < angles.length; i++) {
            //angles_rad[i] = angles[i] * (Math.PI / 180.0);
            angles_rad[i] = Math.toRadians(angles[i]);

            vectors_x[i] = Math.cos(angles_rad[i]);
            vectors_y[i] = Math.sin(angles_rad[i]);
        }

        // 平均を求める
        for (int i = 0; i < len; i++) {
            vector_avg_x += vectors_x[i];
            vector_avg_y += vectors_y[i];
        }

        vector_avg_x = vector_avg_x / (double)len;
        vector_avg_y = vector_avg_y / (double)len;

        // ベクトルから角度に変換
        ang_avg = Math.atan2(vector_avg_y, vector_avg_x);

        // 計算誤差の補正
        if(Math.abs(ang_avg) < Math.pow(10, -8)){
            ang_avg = 0.0;
        }

        System.out.println(Double.toString(Math.toDegrees(ang_avg)) + "\n");
    }
}

https://qiita.com/koyo-miyamura/items/37d555ae150047ebefde