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Raghav Purankar
how to print the average of each column of 2d n*m array using java
1 Answer(s)      3 years and 3 months ago
Posted in : Java Beginners


here is my code:

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class ReadContents {
    public static void main(String[] args) throws IOException {
        File file = new File("file1.txt");
        List<float[]> list = new ArrayList<float[]>();
        Scanner scanner = new Scanner(file).useDelimiter("\n");
        while (scanner.hasNext()) {     
            String[] values = scanner.next().trim().split(" "); 
             float[] floats = new float[values.length];
             for (int i = 0; i < values.length; i++) {
                 floats[i] = Float.parseFloat(values[i]);
                 }
                 list.add(floats);
                 } 
                 float[][] values = new float[list.size()][];
                 for (int i = 0; i < list.size(); i++) {
                     values[i] = list.get(i);
                     for (int j = 0; j < values[i].length; j++) {
                         System.out.print(values[i][j] + " ");
                         }
                         System.out.println();
                 }

it prints the content of file.now i want to calculate mean(average) of each column present in the given file having say n*m matrix.

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View Answers

May 3, 2011 at 10:47 AM


import java.io.File;
import java.io.IOException;
import java.util.ArrayList; 
import java.util.List; 
import java.util.Scanner; 

public class ReadContents {
    public static void main(String[] args) throws IOException {
        float column[] = new float[4];
        File file = new File("rfg.txt"); 
        List<float[]> list = new ArrayList<float[]>(); 
        Scanner scanner = new Scanner(file).useDelimiter("\n");
        while (scanner.hasNext()) {
        String[] values = scanner.next().trim().split(" ");
        float[] floats = new float[values.length];
        for (int i = 0; i < values.length; i++) {
            floats[i] = Float.parseFloat(values[i]); 
            } 
            list.add(floats); 
            }
            float[][] values = new float[list.size()][];
            for (int i = 0; i < list.size(); i++) {
                values[i] = list.get(i);
                for (int j = 0; j < values[i].length; j++) {
                    System.out.print(values[i][j] + " ");
                    column[j] = column[j] + values[i][j];
                    }
                    System.out.println();
                    }
                    for (int i = 0; i < column.length; i++) {
                    System.out.println("Sum of column: "+(i+1)+": "+column[i]);
                    }
    }
}


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