Coding an Equation with Sum of including limitations

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Harrison Dove 2020-8-10

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关闭： MATLAB Answer Bot 2021-8-20

Hi All,

Im just having trouble writing an equation in matlab that will match the following equation given. I have the values of vx and x1 imported in my data but am not sure how to write the equation so that after the value for k is input it can create such an equation. Eg if i were to input input 3 in the command window the equation should be solved as x(3) = (vx(2)(t(3)-t(2)))+(vx(1)(t(2)-t(1)))+x1. Thank you in advance

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Deepak Gupta 2020-8-10

x(k) = sum(vx(2:end)-vx(1:end-1))+x(1)

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Answer 1

Antoine Laurin 2020-8-10

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https://ww2.mathworks.cn/matlabcentral/answers/577552-coding-an-equation-with-sum-of-including-limitations#answer_477568

This is unclear.

What is vx (or vxj) ? A vector ?

What is tj ? A scalar ? An integer ?

Do you want to multiply the value of vxj by the difference (tj+1 - tj) ? Or do you want to access the value of vxj for the index defined by the difference (tj+1 - tj) ?