write a matrix into a File.

[viki Bhardwaj]

Hi everyone,
I want to know that how to write a matrix into text file?
actually here i am trying to write a program which take no of rows and columns from user and also element of matrix and then i want to store that matrix into a separate file(abc.txt) and it's Transpose result
want to store in separate file(xyz.txt). for this i am stuck in, i am not getting idea that how to save my matrix into a file...
i have been searched regarding of my this problem but did not find any clue . let me post my code whatever effort i did to do...

public class MyTransposeOfMatrix {
    public static void main(String[] args) throws FileNotFoundException {
        
        
        PrintWriter pw =new PrintWriter(
           "D:/SCJP Sun/netbeans/scjp practice/src/com/scjp/braintraser/xyz.txt");
        int rows, columns;
        System.out.println("Please enter no of rows:");
        Scanner sc=new Scanner(System.in);
        rows=sc.nextInt();
        System.out.println("Please enter no of columns:");
        columns=sc.nextInt();
        int matrix[][]=new int[rows][columns];
        int tmatrix[][]=new int[columns][rows];
        System.out.println("please enter element for matrix:");
        for(int i=0;i<rows;i++){
            for(int j=0;j<columns;j++){
                matrix[i][j]=sc.nextInt();
            }
       }
       
        for(int i=0;i<rows;i++){
            for(int j=0; j<columns; j++){
                tmatrix[i][j]=matrix[j][i];
            }
        }
        System.out.println("The Matrix is:");
        for(int i=0; i<rows; i++){
//                pw.print(i);
            for(int j=0; j<columns; j++){
//                System.out.print(matrix[i][j]+" ");
                
                pw.print(matrix[i][j]); // here trying to print into file
                                        // but it's printing in single line
            }
            System.out.println("");
        }
        pw.flush();
        System.out.println("The Transpose of Matrix is: ");
        for(int i=0; i<columns; i++){
            for(int j=0; j<rows; j++){
                System.out.print(tmatrix[i][j]+" ");
            }
            System.out.println("");
        }
    }
    
    
}

please help me,

[Winston Gutkowski]

viki Bhardwaj wrote:for this i am stuck in, i am not getting idea that how to save my matrix into a file...

I suspect that's mostly because you don't have a Matrix class.

If you did, then you could implement it's toString() method to return it in String form, and then write that to a File.

Tip: If all your code is in main() (indeed, if your main() method is more than a few lines long) then you're probably doing it WRONG.

Winston

[William Brogden]

Note that any serious program getting user keyboard input should provide for error handling - for example non-digit character input - see the Scanner JavaDocs for the exceptions you should provide for.

Bill

[Ivan Jozsef Balazs]

You could map your Matrix into an XML format and write it as such.

Property has by the way a built-in conversion to XML format, cf. java.util.Properties.storeToXML and loadFromXML.