Question

我的程序正在读取CSV并将数据输入到数组中。一旦数据存储到数组中，我想修改数据以找到某些计算，例如平均值，最大值和最小数量。

我根本看不出我出错的地方......我确信这很简单。任何帮助将不胜感激！

public class calculation {

public static void main(String[] args) throws IOException {

    double year[] = new double [804];
    double month[] = new double [804];
    double tmax[] = new double [804];
    double tmin[] = new double [804];
    double af[] = new double [804];
    double rain[] = new double [804];
    double sun[] = new double [804];
    double tavg[] = new double[804];
    double sumYear = 0;
    double sumMonth = 0;
    double sumTmin = 0;
    double sumTmax = 0;
    double sumRain = 0;
    double sumAF = 0;
    double sumSun = 0;
    int counter = 0;

    //CREATE BUFFERED READER TO READ DATA           
    try {
        BufferedReader file = new BufferedReader(new FileReader("data.csv"));
        String line="";
        //Implement code here
        int index=0;

        //CREATE WHILE LOOP TO READ DATA LINE BY LINE
        while((line = file.readLine()) != null) {
            //Print data to console line by line to ensure it reads data properly
            System.out.println(line);
            //we need to apply split method
            String[] splits = line.split(","); //This will have total of 7 values 

            year[index] = Double.parseDouble(splits[0]);
            month [index] = Double.parseDouble(splits[1]);
            tmax [index] = Double.parseDouble(splits[2]);
            tmin [index] = Double.parseDouble(splits[3]);
            af [index] = Double.parseDouble(splits[4]);
            rain [index] = Double.parseDouble(splits[5]);
            sun [index] = Double.parseDouble(splits[6]);

            sumYear += year[0];
            sumMonth += month[1];
            sumTmax += tmax[2];
            sumTmin += tmin[3];
            sumAF+= af[4];
            sumRain += rain[5];
            sumSun+= sun[6];


            counter++;
            index++;


    }           } catch (FileNotFoundException e1) {
        e1.printStackTrace();
        // TODO Auto-generated catch block
    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

    //now print averages
    double avgTmax = sumTmax/counter;
    double avgTmin = sumTmin/counter;
    double avgFrost = sumAF/counter;
    double avgRain = sumRain/counter;
    double avgSun = sumSun/counter;
    System.out.println("Average: Maximum Temp: " + avgTmax);
    System.out.println("Average: Minimum Temp: " + avgTmin);
    System.out.println("Average: Rain: " + avgRain);
    System.out.println("Average: Frost: " + avgFrost);
    System.out.println("Average: Sun: " + avgSun);


    }   

}

Answer 1

sumYear += year[0];
sumMonth += month[1];
sumTmax += tmax[2];
sumTmin += tmin[3];
sumAF += af[4];
sumRain += rain[5];
sumSun += sun[6];

必须是

sumYear += year[index];
sumMonth += month[index];
sumTmax += tmax[index];
sumTmin += tmin[index];
sumAF += af[index];
sumRain += rain[index];
sumSun += sun[index];

您已阅读由逗号分隔的值组成的行，将其拆分并将个别值（splits[0]，splits[1] .. splits[6]）存储到相应的数组。要阅读它们，您需要使用您写过的相同index。

修改

除非您需要存储实际值，否则您可以删除数组，并且可以简单地将运行总和计算为sumYear += Double.parseDouble(splits[0]);（类似于所有）

为什么我的计算不正确？

1 个答案: