ช่วยเลาด้วย

for i=elements+1 %this for loop will create extra row(s) in matrix A
        if col==elements+1 %if col is equal to elements+1,
        A(i,:)=0; %row element+1 is all zeros
        A(i,j)=1; %except column j (last column) is equal to 1
        else      %if col is not equal to elements+1

                for j=1:1:n_react+n_prod %this for loop ask for charge in all molecules in the equation
                    text6=sprintf('For %s, please identify its charge: ',formula{1,j}); %ask the user to enter the charge
                        if j<=n_react %if number of loop is less than n_react, the input will be stored in matrix A as a positive number
                            A(i,j)=input(text6);
                        else %if number of loop is not less than n_react, the input will be stored in matrix A as a negative number
                            A(i,j)=-input(text6);
                        end
                end
        end
            for col==elements+2 %create one more row
                A(i,:)=0; %row i is all zeros
                A(i,j)=1; %except column j is 1
            end
        end
    end
    disp(A)