Extrapolation using MATLAB

Extrapolation is the method of identifying the value outside the given bound.

we can use interp1 function to extrapolate

Let us take the following example

X	Y
2	66
3	69
4	80
5	87
6	65

In the MATLAB X and Y shall be defined as follows

x=2:6
y=[66 ,69 , 80, 87, 65]

Using extrapolation let us find the value at x=9 as follows

interp1(x,y,9,'linear','extrap')

we get answer as -1