Print lower triangular matrix pattern from given array

Print lower triangular matrix pattern from given array

Input :  1 2 3 4 5

Output :

         1 0 0 0 0

         1 2 0 0 0

         1 2 3 0 0

         1 2 3 4 0

         1 2 3 4 5

Input :  1 2 3

Output :   1 0 0

                1 2 0

                1 2 3

Prerequisite:

Concept to work with Lower & Upper triangular Matrix:

Program to print lower triangular MATRIX from a square MATRIX:

MATLAB CODE:

clc
clear all
close all
x=input('Enter the array:');
l=length(x);
for i=1:l
    k=1;
    for j=1:l
        if(i<j)
            y(i,j)=0;
        else
        y(i,j)=x(k);
        k=k+1;
        end
    end
end

Explanation:

       

Sample Output:

JAVA CODE:

import java.util.Scanner;

class Lovu

{

public static void main(String args[])

{

Scanner obj=new Scanner(System.in);

System.out.println("Enter the array length:");

int l=obj.nextInt();

int ak[]=new int[l];

for(int i=0;i<l;i++)

{

ak[i]=obj.nextInt();

}

int a[][]=new int[l][l];

for(int i=0;i<l;i++)

{

int p=0;

for(int j=0;j<l;j++)

{

if(i<j)

{

a[i][j]=0;

}

else

{

a[i][j]=ak[p];

p=p+1;

}

}

}

for(int i=0;i<l;i++)

{

for(int j=0;j<l;j++)

{

System.out.print(a[i][j]+" ");

}

System.out.println();

}

}

}

Sample Output: