java - 如何从文件中读取整数(X 和 Y 点)并在 Java 中绘制最小回归线？错误

Question

因此，假设我要从 .txt 文件中读取一组点并在这些点的顶部绘制最小二乘回归线。 (我对统计数据也不太熟悉)

My program would plot the points using text (for example, with "X"s representing the points, "-"s the regression line segments, and " * "s where a line segment and a point are located at the same spot)

这些是要从文件中读取的点(第一个整数 x 和第二个整数 y)。 x 坐标在 [0, 40] 范围内，y 坐标在 [1, 20] 范围内。

20 10
0  1
40 20
13 17
13 12
10 ?
the x coordinates represent time
15 0
10 20

此文本中有一些无效点，但程序最终会忽略它，但不会停止读取文件。

这是我想出的，但仍然给出 ArrayIndexBound:2 错误

import java.awt.*;
import java.io.*;
import java.util.StringTokenizer;

public class A{
    public static void main(String[] args){

        processValuesFromFile("points.txt");

    }

    public static void processValuesFromFile(String filename){
        BufferedReader inputFile;
        String line;
        int[][] points;

        try{
            inputFile = new BufferedReader(new FileReader(filename));
            line = inputFile.readLine();

            while(line!= null){
                points = readPoints(inputFile,line);
                printPoints(points);
                //
                line = inputFile.readLine();
            }
            inputFile.close();



        }catch (IOException | ArrayIndexOutOfBoundsException ioe){
            System.out.println(ioe.getMessage());
            //ioe.printStackTrace();
        }
    }

    public static int[][] readPoints(BufferedReader inputFile, String line) throws IOException{
        String[] split;
        String inputLine;
        int[][] points;
        int pointSize = 9;

        points = new int[pointSize][pointSize];
        for(int row=0; row<pointSize;row++){
            inputLine = inputFile.readLine();
            System.out.println(inputFile);
            split = inputLine.split("\\s+");

            for(int col =0; col <pointSize;col++){
                points[row][col] = Integer.parseInt(split[col]);
            }

        }
        return points;

    }

    public static void printPoints(int[][] points) {
        for (int row=0; row < points.length; row++) {
            for (int col=0; col < points[row].length; col++) {
                System.out.print(points[row][col] +"\t");
            }
            System.out.println();
        }
    }
}

Answer 1

最好创建一个代表点的类。

class Point{

int x;
int y;

}

然后创建一个数组或点的集合

Point[] points = new Point[10];

或

List<Point> points = new ArrayList<Point>();