How to mark a specific point in matlab plot?

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LIM MING HUI
LIM MING HUI 2022-4-10
评论： Voss 2022-4-12
Hello,
I'm trying to mark a specific point on the curves when y = 0. Because I want to know the value of x when y = 0.
but I didn't succeed....
x = 0:0.01:66.03;
y=(3.7*(10*(x/66.03).^3-15*(x/66.03).^4+6*(x/66.03).^5)-1.86);
plot(x,y,'c-','LineWidth',3);
y1=0;
x1=interp1(x,y,y);
hold on;
semilogy(x1,y1,'*r')
Any idea on how to fix the problem?
Thank you in advance for your help!

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Voss
Voss 2022-4-10
Ran in:
To interpolate to find a value of x for a given value of y, treat y as the independent variable and x as dependent on y.
x = 0:0.01:66.03;
y=(3.7*(10*(x/66.03).^3-15*(x/66.03).^4+6*(x/66.03).^5)-1.86);
plot(x,y,'c-','LineWidth',3);
y1=0;
% x1=interp1(x,y,y);
x1=interp1(y,x,y1); % given x(y), find x(y1)
hold on;
semilogy(x1,y1,'*r')

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