MATLAB: Problems with a for loop – Math Solves Everything

Hello everybody,

I hope, someone can help me. I am desperate about it right now.

I'm trying to implement the following mathematical formula:

tmp = ck * C_1 + ckk * C_2 + ckkk * C_3 + ckkkk * C_4

C_1 to C_4 are fixed values. Now different index combinations are to be tested and these are to be saved. The sum tmp should only occur up to a certain threshold value. A small example:

tmp (1) = 0 * C_1 + 0 * C_2 + 0 * C_3 + 0 * C_4

tmp (2) = 1 * C_1 + 0 * C_2 + 0 * C_3 + 0 * C_4

tmp (3) = 2 * C_1 + 0 * C_2 + 0 * C_3 + 0 * C_4 …

tmp (xx) = 0 * C_1 + 1 * C_2 + 0 * C_3 + 0 * C_4

tmp (xxx) = 2 * C_1 + 1 * C_2 + 1 * C_3 + 4 * C_4

tmp (n)

The output should be a matrix with the individual indices.

I have the following code, but I also got the problems, that it won't start at zero.

clc
clear all
G = sort([4.3,10,0.5,6],2);   
[numRows,numCols] = size(G);
F = 7;
limit = 3 * F;
n = 0;
                
                
                    
                        
                            for ck = 1:limit
                                for ckk = 1:limit
                                    for ckkk = 1:limit
                                        for ckkkk = 1:limit
                
            firstC = G(1);
            secondC = G(2);
            thirdC = G(3);
            fourthC =G(4);
            tmp = (ck-1)*firstC + (ckk-1)* secondC + (ckkk-1) * thirdC + (ckkkk-1)*fourthC;
            
            if tmp<limit 
                n = n+1;
                N(n) = tmp;
                disp([' N( ' num2str(n) ')  = ' num2str(ck) '*' num2str(firstC) '+' num2str(ck) ' * ' num2str(secondC) '+' num2str(ckk) ' * ' num2str(thirdC) '+' num2str(ckkk) '*' num2str(fourthC)]);
                
                
            end
                end
                end
                            end
                        
               end

Best Answer