How can I interpolate a point in a x,y graph given only one of these values and being the point on the line?

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Diego Dranuta el 12 de Sept. de 2019

I have a sets of graphs where I want to show 2 points on each plot. One on .5 (y value) and the other on .9 (also y value)

I have tried

plot(x,y)

hold on

plot(x(),y(.5),'r*')

But did not work out.

Any ideas?

MATLAB Mathematics Interpolation

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