Pair sums (how to avoid duplication?)

Hi I try to print pairs of number has the sum 12 in the input matrix, but what can I do to aviod duplication? for example if 3 9 is doesn't need to print 9 3. Also what can I do if I always want the small number at the front?

Here is my code

%print every set of number that sum to target value t
clear;clc;
%input an matrix 
a=input('Enter a matrix:');
t=12;
%check the size of the matrix
[rows,cols]=size(a);

%loop through 
for r=1:rows
    
    for c=1:cols 
        
        for i=1:rows
            
            for f=1:cols
                
                
                if a(r,c)+a(i,f)==t 
                    
                    disp(a(r,c));
                    disp(a(i,f));
                end
            end
        end
    end
end

[KSSV]

Try < if you want small number in the first.

You need not use loops for this. Give one working example.

[Shiyun Li]

%print every set of number that sum to target value t
clear;clc;
%input an matrix 
a=input('Enter a matrix:');

%check the size of the matrix
[rows,cols]=size(a);

%loop through 
for r=1:rows
    
    for c=1:cols 
        
        for i=1:rows
            
            for f=1:cols
                
                
                if a(r,c)+a(i,f)==12 
                    fprintf('%d,%d\n',a(r,c), a(i,f));
                    
                end
            end
        end
    end
end

%command window 
Enter a matrix:[1 3 5 4 6 2 9 12 7 11 8 0]
1,11
3,9
5,7
4,8
6,6
9,3
12,0
7,5
11,1
8,4
0,12

[Shiyun Li]

Here is one of the example, sorry I can explain more clearly. What I want is the pairs of number only print once if 3, 9 is printed then 9,3 will not. And what can I do if I want the smaller number at the front when I print the pair? Thank you.

Answer 1

[Deepak Gupta]

Seems like you have already found the numbers which add up to the required number.

Now Save these numbers in an array with 2 columns. Then swap the column entries if column 1 element is larger than 2nd.

for i = 1:size(A, 1)
    if(A(i, 1)>A(i, 2))
        temp = A(i, 2);
        A(i, 2) = A(i,1);
        A(i,1) = temp;
    end
end

Now to remove the repititive rows

A=unique(A,'rows')