How can I connect my equations for a shear/bending moment diagram?

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matlabuser 2020-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/520561-how-can-i-connect-my-equations-for-a-shear-bending-moment-diagram

回答： Pravin Jagtap 2020-4-27

I have a 1.2 m beam. That is the vector l. SN1, SN2, and SN3 represent the three equations for my shear force diagram. When I go to plot them, they are disconnected. That is the problem. How can I make my plot connect the end of one line segment to the beginning of the next?

l = 0:.001:1.2;
    SN1 = -150*(l(logical(S1)));
    SN2 = -150*(l(logical(S2))) + 90;
    SN3 = -150*(l(logical(S3))) + 180;
    plot((l(logical(S1))), SN1, 'r')
    hold on
    plot((l(logical(S2))), SN2, 'r')
    plot((l(logical(S3))), SN3, 'r')

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matlabuser 2020-4-25

plot((l(logical(S1))), SN1, 'r',(l(logical(S2))), SN2, 'r',(l(logical(S3))), SN3, 'r')

This is another way that I have plotted the functions. They are still disconnected in the same way, though. Hopefully this will help identify the problem in another way.