Why won't my graph plot?

Question

Julie Miller 2019-10-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/488623-why-won-t-my-graph-plot

回答： Daniel M 2019-10-31

采纳的回答： Star Strider

This is my code:

%use a for loop to set a range with increments

for d=0:0.1:20

%Find the length of cable 3 by plugging in the given distance

L=(100 + d^2)^(1/2);

%Write the equations for the tensile forces in the three cables

A=[0.348, -0.557, 0; -0.348, -0.239, (d/L); 0.870, 0.796, (10/L)];

C=[0; 0; 1000];

%Calculate the tensile forces

T=inv(A)*C;

%Find the maximum tensile force

M=max(T);

%Use the maximum tensile force to find the factor of safety

FS=1500/M;

end

plot(FS, d)

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Answer 1

Star Strider 2019-10-31

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/488623-why-won-t-my-graph-plot#answer_399244

在 MATLAB Online 中打开

You need to save the elements of ‘FS’ in order to plot them against vector ‘d’.

I slightly edited your code:

%use a for loop to set a range with increments
dv=0:0.1:20;                                    % Define Vector
for k = 1:numel(dv)
    d = dv(k);
    %Find the length of cable 3 by plugging in the given distance
    L=(100 + d^2)^(1/2);
    %Write the equations for the tensile forces in the three cables
    A=[0.348, -0.557, 0; -0.348, -0.239, (d/L); 0.870, 0.796, (10/L)];
    C=[0; 0; 1000];
    %Calculate the tensile forces
    T=inv(A)*C;
    %Find the maximum tensile force
    M=max(T);
    %Use the maximum tensile force to find the factor of safety
    FS(k)=1500/M;                               % Save Results As Vector
end
plot(FS, dv)