How to show matrix top right triangular java

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How to show matrix top right triangular java

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#1 by (4 votes)
#2 by (2 votes)

0

Hello, good as I show the upper triangle of this matrix, thank you!

System.out.println("Mostra la matriu");

        for (int i = 0; i < mat.length; i++) {
            for (int j = 0; j < mat[i].length; j++) {
                System.out.print(mat[i][j] + "\t");

            }
            System.out.println();

        }

I would like the upper right triangle, the diagonal of the matrix up.

Given the matrix:

I would like to get the matrix:

java

asked by Iron Man 22.02.2018 в 20:00

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2 answers

4

With this should be enough:

System.out.println("Mostra la matriu");        
    for (int i = 0; i < mat.length; i++) {
        for (int j = i; j < mat[i].length; j++) {
            System.out.print(mat[i][j] + "\t");             
        }
        System.out.println();           
    }

What you do is initialize the second for in the horizontal position equal to the vertical, which will generate the upper triangle.

If you would like to generate the lower triangle , the for should be for (int j = 0; j < i;j++)

answered by 22.02.2018 в 20:08

I am trying to change from IlistEmployee to listEmployee Jquery Traversing - Select "Surroundings"

score 2 · Accepted Answer

To do what you want, you must paint blanks in the positions of the matrix you are discarding. So you should check if the current cell of the matrix you want to paint or discard.

   for (int i = 0; i < mat.length; i++) {
        for (int j = 0; j < mat[i].length; j++) {
            if (j < i) {
                System.out.print(" ");
            } else {
                System.out.print(mat[i][j]);
            }
        }
        System.out.println();           
    }