Program to Display The Upper Triangular Matrix

Program to display the upper triangular matrix

Explanation

In this program, we need to display the upper triangular matrix.

Upper Triangular Matrix

Upper triangular matrix is a square matrix in which all the elements below the principle diagonal are zero. To find the upper triangular matrix, a matrix needs to be a square matrix that is, the number of rows and columns in the matrix needs to be equal. Dimensions of a typical square matrix can be represented by n x n.

Consider the above example, principle diagonal element of given matrix is (1, 6, 6). All the elements below diagonal needs to be zero to convert it into an upper triangular matrix, in our example, those elements are at positions (2,1), (3,1) and (3,2). To convert given matrix into the upper triangular matrix, loop through the matrix and set the values of the element to zero where row number is greater than column number.

Algorithm

Declare and initialize a two-dimensional array a.
Calculate the number of rows and columns present in the array and store it in variables rows and cols respectively.
If the number of rows is not equal to the number of columns, it implies that the given matrix is not a square matrix. Hence, given matrix cannot be converted to the upper triangular matrix. Display the error message.
If rows = cols, traverse the array a using two loops where outer loop represents the rows, and inner loop represents the columns of the array a. To convert given matrix to upper triangular matrix set the elements of the array to 0 where (i > j) that is, the row number is greater than column number.
Display the resulting matrix.

Solution

Python

#Initialize matrix a
a = [   
       [1, 2, 3],
       [8, 6, 4],
       [4, 5, 6]
    ];
 
#Calculates number of rows and columns present in given matrix
rows = len(a);
cols = len(a[0]);
 
if(rows != cols):
    print("Matrix should be a square matrix");
else:   
    #Performs required operation to convert given matrix into upper triangular matrix
    print("Upper triangular matrix: ");
    for i in range(0, rows):
        for j in range(0, cols):
            if(i > j):
                print("0"),
            else:
                print(a[i][j]),
 
        print(" ");

Output:

Upper triangular matrix: 
1 2 3 
0 6 4 
0 0 6

C

#include <stdio.h>
 
int main()
{
    int rows, cols;
        
    //Initialize matrix a
    int a[][3] = {   
                    {1, 2, 3},
                    {8, 6, 4},
                    {4, 5, 6}
                 };
    
    //Calculates number of rows and columns present in given matrix
    rows = (sizeof(a)/sizeof(a[0]));
    cols = (sizeof(a)/sizeof(a[0][0]))/rows;
    
    if(rows != cols){
        printf("Matrix should be a square matrix\n");
    }
    else{
        //Performs required operation to convert given matrix into upper triangular matrix
        printf("Upper triangular matrix: \n");
        for(int i = 0; i < rows; i++){
            for(int j = 0; j < cols; j++){
              if(i > j)
                printf("0 ");
              else
                printf("%d ", a[i][j]);
            }
            printf("\n");
        }
    }
        
    return 0;
}

Output:

Upper triangular matrix: 
1 2 3 
0 6 4 
0 0 6

JAVA

public class UpperTriangular
{
    public static void main(String[] args) {
        int rows, cols;
        
        //Initialize matrix a
        int a[][] = {   
                        {1, 2, 3},
                        {8, 6, 4},
                        {4, 5, 6}
                    };
          
          //Calculates number of rows and columns present in given matrix
          rows = a.length;
        cols = a[0].length;
        
        if(rows != cols){
            System.out.println("Matrix should be a square matrix");
        }
        else {
            //Performs required operation to convert given matrix into upper triangular matrix
            System.out.println("Upper triangular matrix: ");
            for(int i = 0; i < rows; i++){
                for(int j = 0; j < cols; j++){
                  if(i > j)
                    System.out.print("0 ");
                  else
                    System.out.print(a[i][j] + " ");
                }
                System.out.println();
            }
        }
    }
}

Output:

Upper triangular matrix: 
1 2 3 
0 6 4 
0 0 6

C#

using System;
                    
public class UpperTriangular
{
    public static void Main()
    {
        int rows, cols;
        
        //Initialize matrix a
        int[,] a = {   
                        {1, 2, 3},
                        {8, 6, 4},
                        {4, 5, 6}
                   };
          
          //Calculates number of rows and columns present in given matrix
          rows = a.GetLength(0);
        cols = a.GetLength(1);
        
        if(rows != cols){
            Console.WriteLine("Matrix should be a square matrix");
        }
        else {
            //Performs required operation to convert given matrix into upper triangular matrix
            Console.WriteLine("Upper triangular matrix: ");
            for(int i = 0; i < rows; i++){
                for(int j = 0; j < cols; j++){
                  if(i > j)
                    Console.Write("0 ");
                  else
                    Console.Write(a[i,j] + " ");
                }
                Console.WriteLine();
            }
        }
    }
}

Output:

Upper triangular matrix: 
1 2 3 
0 6 4 
0 0 6

PHP

<!DOCTYPE html>
<html>
<body>
<?php
//Initialize matrix a
$a = array(   
            array(1, 2, 3),
            array(8, 6, 4),
            array(4, 5, 6)
          );
 
//Calculates number of rows and columns present in given matrix
$rows = count($a);
$cols = count($a[0]);
 
if($rows != $cols){
    print("Matrix should be a square matrix<br>");
}
else {
    //Performs required operation to convert given matrix into upper triangular matrix
    print("Upper triangular matrix: <br>");
    for($i = 0; $i < $rows; $i++){
        for($j = 0; $j < $cols; $j++){
          if($i > $j)
            print("0 ");
          else
            print($a[$i][$j] . " ");
        }
        print("<br>");
    }
}
?>
</body>
</html>

Output:

Upper triangular matrix: 
1 2 3 
0 6 4 
0 0 6

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