time series interpolation of irregular data

here goes the data , i need data for vacant years ,

Thank you!

2012 105683

2013 1,108,498

2014 1,177,810

2015 1,271,872

2016 1,351,970

2017 1,433,392

2018 1,486,493

2019 1,546,517

2020 1,598,41

2021

2022

2023

2024

2025

2026

2027

2028 251800

[Harish Vernekar]

Thank YOU

Answer 1

[KSSV]

data = [ 2012  105683 
 
  2013  1108498 
 
  2014  1177810 
 
  2015  1271872 
 
  2016  1351970 
 
  2017  1433392 
 
  2018  1486493 
 
  2019  1546517 
 
  2020  159841 
 
  2021  NaN
		
  2022  NaN
		
  2023  NaN
		
  2024  NaN
		
  2025  NaN
		
  2026  NaN
		
  2027  NaN
 
  2028  251800 ] ;

x = data(:,1) ; 
y = data(:,2) ; 

idx = isnan(y) ; 
y(idx) = interp1(x(~idx),y(~idx),x(idx)) ;

Answer 2

[Sargondjani]

You can use "griddedInterpolant". I would use 'pchip' as method.