Raghav Purankar
how to print the content of file in 2d matrix having same dimension as given in file(n*m).
1 Answer(s)      4 years ago
Posted in : Java Beginners

here is code:

import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class mat1 { public static void main(String[] args) throws IOException { Scanner s = new Scanner(new File("rfg.txt")); List list = new ArrayList(); while (s.hasNextLine()) { String line[] = s.nextLine().split(" ");

     list.add(new double[] { Double.parseDouble(line[0]),Double.parseDouble(line[1]),Double.parseDouble(line[2]),Double.parseDouble(line[3]) });
}
    int numberOfRows = list.size();
    int numberOfColumns =4; 
    double[][] floatValues = new double[numberOfRows][numberOfColumns];
    for (int i = 0; i < numberOfRows; i++) {
        for(int j=0;j<numberOfColumns;j++){
        floatValues[i] = list.get(i);
        System.out.print(floatValues[i][j] + " "/* + floatValues[i][1] + " " + floatValues[i][2]*/);

        }
        System.out.println();
    }

}}

here is .txt file:

1.0 3.1 2.1 3.4 2.4 2.0 4.6 5.1 0.2 3.3 4.7 9.1 4.0 5.4 5.1 3.2 6.1 2.1 6.4 2.6

here in program i have to specify no. of columns every time. it is not the case. but i want to print the file of any dimensions in the form of 2d n*m matrix. pls help me

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May 2, 2011 at 3:01 PM


import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class mat1 {
    public static void main(String[] args) throws IOException {
    Scanner s = new Scanner(new File("rfg.txt"));

        List<double[]> list = new ArrayList<double[]>();

        while (s.hasNextLine()) {
            String[] line = s.nextLine().split(" ");
            list.add(new double[] { Double.parseDouble(line[0]), Double.parseDouble(line[1]), Double.parseDouble(line[2]), Double.parseDouble(line[3]) });
        }

        int numberOfRows = list.size();
        int numberOfColumns = 4;
        double[][] doubleValues = new double[numberOfRows][numberOfColumns];
        for (int i=0 ; i < doubleValues.length ; i++)
        {    doubleValues[i] = list.get(i);  
            System.out.println();
            for  (int j=0 ; j < doubleValues[i].length ; j++){
                System.out.print(doubleValues[i][j]+" ");
                  }
        }
    }
}









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