How to find X Value given Y value and show the point on a plot

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Matlab_Student 2017-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/360286-how-to-find-x-value-given-y-value-and-show-the-point-on-a-plot

评论： Onu Student 2020-11-5

采纳的回答： KSSV

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I have an semilog plot below.

 %
x = 0:1:25;
y = exp(-0.03*x);
figure;
semilogy(x,y);
%

I want to let the program calculate the x value when y=0.5 and indicate this point (x,0.5) on the plot with dashed lines connecting to the two axes. How do I achieve this?

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采纳的回答

KSSV 2017-10-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360286-how-to-find-x-value-given-y-value-and-show-the-point-on-a-plot#answer_284859

在 MATLAB Online 中打开

x = 0:1:25;
y = exp(-0.03*x);
figure;
semilogy(x,y);
%
yi = 0.5 ;
xi = interp1(y,x,yi) ;
hold on
semilogy(xi,yi,'*r')

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Coryn Melissa LLamoza Carabali 2020-10-14

yes! looking for both questions above. Anybody that can help with this ;(

Onu Student 2020-11-5

you can add annotations to plots text(x,y,txt)

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