Adding Symbolic equations using while loops

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Emma Sellers 2019-11-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489815-adding-symbolic-equations-using-while-loops

I am attempting to create a matlab version of the KCL equation. I can't figure out a way to loop through all the possible equations and ADD them together.. as symbolic equations. I eventually need to end up with a system of equations that I can set equal to zero and then Solve. Currently this code won't even give me a single equation. It just spits out 0 unitl infinity. Any ideas on how to fix this? I dont want to have to hard code the addition of all of these possible outcomes. Thanks!!

nodes = sym('n',[1 10])
nodes(1,1)=0; 
disp(nodes)
answer=inputdlg({'nodes'});
n=str2double(answer(1,1));
Resistance=Inf(n);
A=1;
B=0;
C=0; 
i=0
    while A < n 
       B = B+1;
       C = C+1;
         while B < n
             B = B+1;
             answer =inputdlg(['Enter resistance between ',num2str(A),' and ',num2str(B),' or enter "I" for infinite resistance.']);
             if strcmp(answer, 'I')
                   i = i+1; 
             else
                     Resistance(A,B) = str2double(answer)
                     Resistance(B,A) = str2double(answer)
             end
          end 
       A = A+1;
       B = C; 
    end 
disp(Resistance)
Col =1;
Row =0;
C=0; 
while Col < n 
    
    Row = Row+1;
    C = C+1; 
    
    while Row < n
       EquationExample = (nodes(1,Col)-nodes(1,Row))/(Resistance(1,Row))
       disp(EquationExample)
    end 
    
    Col = Col+1;
    Row = C; 
    
end 