## Code for finding extrapolated value when two point are given?

### S (view profile)

on 14 May 2013

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).

## Products

No products are associated with this question.

### the cyclist (view profile)

on 14 May 2013

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

```doc interp1
```

for details.

Be careful. Extrapolation is a tricky business.

### Walter Roberson (view profile)

on 14 May 2013

interp1()

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

S

### S (view profile)

on 16 May 2013

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

Matt Kindig

### Matt Kindig (view profile)

on 16 May 2013

This formula will also do extrapolation.

#### Join the 15-year community celebration.

Play games and win prizes!

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi