lab 4 / intrapolation_and_extrapolation

% my func 2x^3-8sin(x)-2 method of intrapolation 'next', 'pchip'
x=0:2*pi;
y=2*x.^3-8*sin(x)-2;
%test_interp(x,y) %no problem
%test_extrap(x,y)
%test_gridinterp(x,y) %no problem
numer_diff(x,y)
%test_gridextrap(x,y) %no problems hres