how to extrapolate with given data? (maybe very simple)

I want to guess outside the given data! For example data x = 1:5 y = [7 9 10 11 12] are given. And I want to guess the values at x=6,7. (For any method) How can I do it? Help me..

Answer 1

[Stephen23]

>> interp1(x,y,[6,7],'linear','extrap')
ans =
   13   14

And remember that extrapolated values are always to be taken with a pinch of salt.

[JaeSung Choi]

oh my god, thank you very much!! you saved me from searching

[riadh euldji]

hello sir how can do extrapolation

let's take this exemple to extrapolate beyond the range x =1:5 like 6 to 8

and our new rang will be x1=1:8 is that possible ????

[Stephen23]

@riadh euldji: did you try the code given in my answer ????