How to find X value given Y value and show it

I am trying to find a value in a plot that is generated using the following matlab function. I've tried using this z=find(y==0.0625); but it doesn´t seem to be working.

function con = funcCon (cMax)

% Time when the max concentration happens.

B = 3;

% mg to administer.

A = (cMax / B) * exp(1);

% Time.

t = [1:50];

y(1,1) = 0;

for i = 2:50

con = A*t(1,i)*exp(-t(1,i)/B);

y(1,i) = con;

end

plot(t,y)

end

Answer 1

[Image Analyst]

See the FAQ:

https://matlab.fandom.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

Try this

[yMax, indexOfMax] = max(y)
tMax = t(indexOfMax)