To Write a function called voltage that computes the voltages at different junctions in electrical circuit. after writing the program the output is not coming please help

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PRASANTH R 2020-12-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/703312-to-write-a-function-called-voltage-that-computes-the-voltages-at-different-junctions-in-electrical-c

编辑： Rena Berman 2023-12-29

function sol = voltage(V,R)
M =[R(2)*R(7)+R(1)*R(2)+R(1)*R(7),-R(1)*R(2),0;-R(3)*R(4)*R(8),R(4)*R(7)*R(8)+R(3)*R(4)*R(8)+R(3)*R(4)*R(7)+R(3)*R(7)*R(8),-R(3)*R(4)*R(7);0,-R(5)*R(6),R(6)*R(8)+R(5)*R(6)+R(5)*R(8)];
y =V*[R(2)*R(7);R(4)*R(7)*R(8);R(6)*R(8)];
SOL=M\y;
end

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回答（5 个）

Ritvij Sahasrabuddhe 2021-1-2

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You have used 'sol' and 'SOL' as function def output, which are considered 2 different variables

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PRASANTH R 2020-12-27

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https://ww2.mathworks.cn/matlabcentral/answers/703312-to-write-a-function-called-voltage-that-computes-the-voltages-at-different-junctions-in-electrical-c#answer_585152

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PRASANTH R 2020-12-27

how to get result without these errors.

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Anthony 2021-3-1

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https://ww2.mathworks.cn/matlabcentral/answers/703312-to-write-a-function-called-voltage-that-computes-the-voltages-at-different-junctions-in-electrical-c#answer_636546

编辑：DGM 2023-3-4

在 MATLAB Online 中打开

function sol = voltage(V,R)
    M =[R(2)*R(7)+R(1)*R(2)+R(1)*R(7),-R(1)*R(2),0;
        -R(3)*R(4)*R(8),R(4)*R(7)*R(8)+R(3)*R(4)*R(8)+R(3)*R(4)*R(7)+R(3)*R(7)*R(8),-R(3)*R(4)*R(7);
        0,-R(5)*R(6),R(6)*R(8)+R(5)*R(6)+R(5)*R(8)];
    y =V*[R(2)*R(7);R(4)*R(7)*R(8);R(6)*R(8)];
    sol=M\y;
end

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Tapan Chahar 2022-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/703312-to-write-a-function-called-voltage-that-computes-the-voltages-at-different-junctions-in-electrical-c#answer_964235

编辑：DGM 2023-3-4

在 MATLAB Online 中打开

function [X]=voltage(V,R)
% Writing equations about the 3 node points using Kirchoffs Law & rewritting
% them in terms of matrix we get
if R(1)==0||R(3)==0||R(5)==0
    % When resistor R1 =0
    if R(1)==0
        A=[(1/R(3)+1/R(7)+1/R(8)+1/R(4)),(-1/R(8)) ; (-1/R(8)),(1/R(5)+1/R(8)+1/R(6))];
        b=[(V/R(3)+V/R(7));V/R(5)];
        XX=A\b;
        X=[V;XX];
    end
    % When resistor R3 =0    
    if R(3)==0
        A=[(1/R(1)+1/R(2)+1/R(7)),0 ; (-1/R(8)),(1/R(5)+1/R(8)+1/R(6))];
        b=[(V/R(1)+V/R(7));V/R(5)];
        XX=A\b;
        X=[XX(1);V;XX(2)];
    end
    % When resistor R5 =0   
    if R(5)==0
        A=[(1/R(1)+1/R(2)+1/R(7)),(-1/R(7)) ; (-1/R(7)),(1/R(3)+1/R(4)+1/R(7)+1/R(8))];
        b=[V/R(1);V/R(3)+V/R(8)];
        XX=A\b;
        X=[XX;V];
    end
    % When both resistor R3 & R5 are =0
    if R(3)==0&R(5)==0
        A=[(1/R(1)+1/R(2)+1/R(7))];
        b=[V/R(1)+V/R(7)];
        XX=A\b;
        X=[XX;V;V];
    end
    % When both resistor R1 & R3 are =0  
    if R(1)==0&R(3)==0
        A=[(1/R(5)+1/R(6)+1/R(8))];
        b=[V/R(5)+V/R(8)];
        XX=A\b;
        X=[V;V;XX];
    end
    % When both resistor R1 & R5 are =0    
    if R(1)==0&R(5)==0
        A=[(1/R(3)+1/R(4)+1/R(7)+1/R(8))];
        b=[V/R(3)+V/R(7)+V/R(8)];
        XX=A\b;
        X=[V;XX;V];
    end
    % When resistor R1, R3 & R5 are =0    
    if R(1)==0&R(3)==0&R(5)==0
        X=[V;V;V];
    end
    
    % When resistor R1,R3 & R5 are non zero
else
    A=[(1/R(1)+1/R(2)+1/R(7)),(-1/R(7)),0 ; (-1/R(7)),(1/R(3)+1/R(7)+1/R(8)+1/R(4)),(-1/R(8)) ; 0,(-1/R(8)),(1/R(5)+1/R(8)+1/R(6))];
    b=[V/R(1);V/R(3);V/R(5)];
    X=A\b;
end
end

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Tapan Chahar 2022-5-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/703312-to-write-a-function-called-voltage-that-computes-the-voltages-at-different-junctions-in-electrical-c#answer_964240

在 MATLAB Online 中打开

function X = voltage(V,R)
    A = [ R(2)*R(7) + R(1)*R(2) + R(1)*R(7), -R(1)*R(2),                                                        0;
          -R(3)*R(4)*R(8),                   R(4)*R(7)*R(8) + R(3)*R(4)*R(8) + R(3)*R(4)*R(7) + R(3)*R(7)*R(8), -R(3)*R(4)*R(7);
          0,                                 -R(5)*R(6),                                                        R(6)*R(8) + R(5)*R(6) + R(5)*R(8) ];
    
    b = V * [R(2)*R(7); R(4)*R(7)*R(8); R(6)*R(8)];
    X = A \ b;
end