Code for finding extrapolated value when two point are given?

there are two point A (x1,y1)and B(x2,y2) given trying to extrapolate at third point c(x3,y3). I am knowing the value of A(x1,y1) and B(x2,y2), How can I compute the value of C(x3,y3).

Answer 1

[the cyclist]

You can use the MATLAB function interp1() to do extrapolation. Read

doc interp1

for details.

Be careful. Extrapolation is a tricky business.

Answer 2

[Walter Roberson]

interp1()

Or just use standard geometry... y = m*x + b, m = (y2-y1)/(x2-x1)

[RS]

For extrapolation how can I write, I think this is for interpolation?

[Matt Kindig]

This formula will also do extrapolation.