Finding another point on the curve

Lets say I have the following code which plots the curve out.

[y,t] = step(Pz);
plot(t,y);

I have found a point on the curve and would like to find another point which is very close to the first point.

The first point is (0.2011,0.0197).

The second point should be (0.2016,y).

How do I find the value of y for the second point?

Answer 1

[Andrei Bobrov]

try this is code:

yout = interp1(t,y,.2016)

ADD

yin - your value of y

tout = fzero(@(t1)yin - interp1(t,y,t1),0)

[Wern-Juin Choy]

How about if I want to find the value of t given the value of y?

[Andrei Bobrov]

see ADD