How to plot recursive function/how to avoid infinite recursion?

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Studentguy 2023-11-21

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编辑： Florian Bidaud 2023-11-21

Hey there

Im trying to plot the following equation

a(n+1)=a(n)+b(n+1)*0.0215

where

b(n+1)=b(n)+(9.81/0.94)*sin(a(n))*0.0215

a(0)=65

b(0)=0

Is it possible to plot the first line as a graph in Matlab, untill a reaches reaches 65 again (should be a U shaped curve)?

I've tried a few things but the error message tells me there is an infinite recursion.

Any help is greatly appriciated.

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Dyuman Joshi 2023-11-21

"I've tried a few things but the error message tells me there is an infinite recursion."

Please share your code you have written yet.

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回答（1 个）

Florian Bidaud 2023-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/2050167-how-to-plot-recursive-function-how-to-avoid-infinite-recursion#answer_1357197

在 MATLAB Online 中打开

a(1) = 65;

b(1)= 0;

i = 1;

while a(i)>a(1) || i==1

b(i+1) = b(i) + 9.81/0.94*sin(a(i))*0.0215;

a(i+1) = a(i) + 0.0215*b(i+1);

i = i+1;

end

plot(a)

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Studentguy 2023-11-21

Thank you so much!

Florian Bidaud 2023-11-21

编辑：Florian Bidaud 2023-11-21

You're welcome ! Please accept the answer if you're happy with it :)

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