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

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Matlab_Student
Matlab_Student 2017-10-8
评论： Onu Student 2020-11-5
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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KSSV
KSSV 2017-10-9
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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