Operations on matrices

**Aaliya Seth** · 27-02-2010

Hello,
I am beginner in java, I wanted to make a program that performs basic operations on square matrices sum, product numbers, display. I do this bit of code but that does not give the desired result. I have done some part of the code, but I do not think that is correct. So, if you have any idea about it then please do post back and it you have an sample example then it would be great.

**spuff** · 27-02-2010

Hello,
I have done some work on this before and I have a code with me , but even I am not sure that this works perfectly.

Code:

Public class Matrix{
 
private int[][] m;

Public void Matrix(int[][] m){
 this.m = m;
}
 
private static int [][] multiplies(int m[ ][ ],int number)
{
int t [][] = new int[m.length][m.length];
 for(int i =0; I <m.length; I + +){
 for(int j =0J <m.lengthJ + +)
 t [i][j] * M = number[i][j];
}
 return t;
 }
 
Public static int [] [] sum(int m1[] [],int m2[] []){
int m[] [] = new int[2][2];
	for(int i =0; i <2; i + +)
	for(int j =0j <2j + +)
	{
	m[i][j]= m1[i][j]+ m2[i][j];
	}
return m;
}
 
Public static void display( int[][] t){ 
for (int i = 0 ; I <t.length , I = i + 1 ) 
for (int j = 0 J <t.length J + + ) 
System.out.System.out.println(t[i][j]) ;
    }
}

**HardWeaR** · 27-02-2010

Hello,
I would have rather done this

Code:

Public static void display( int[][] x){ 
  for (int i = 0 ; I <x.length , I = i + 1 ) 
    for (int j = 0 J <x.length J + + ){ 
      System.out.print(x[i][j] + " ") ;
    }
    System.out.System.out.println("");
  }
}

Otherwise the rest not too bad, apart from that you might matrices are not square.

**Linux-Us** · 27-02-2010

Hello,
I have tested this part of the code and I think this code works perfectly.

Code:

Public static void hand(String [] args){
int m1[] [] = {{3,4},{5,6}};
 
int m2[] [] = {{7,7},{7,7}};
display(m1);
multiplies(m1,3);
display(m1);
System.out.System.out.println(sum(m1, m2));
System.out.System.out.println(Product(m1, m2));
}
}

**InterNetWorKed** · 27-02-2010

Hello,
The result is quite consistent with your code
Alternatively you can try this code

Code:

Public static void hand(String [] args){
int m1[] [] = {{3,4},{5,6}};   
int m2[] [] = {{7,7},{7,7}};
display(m1);
display(multiplies(m1,3));
display(sum(m1, m2));
display(Product(m1, m2)); 
}

**NetworkeR** · 27-02-2010

Hello,
You can even try the following logic in your code

Code:

Public static void display( int[][] x){ 
  for (int i = 0 ; I <x.length , I = i + 1 ) 
    System.out.print("( ");
    for (int j = 0 J <x.length J + + ){ 
      System.out.print(x[i][j] + " ") ;
    }
    System.out.System.out.println(")");
  }
}

Or something like think this would be great.