Cubic Splines for Interpolation

Given an array of data T.

I have one missing element which I would like to use interpolation to find.

How do I use cubic splines to interpolate this element?

Answer 1

[madhan ravi]

since you didn't provide any details see csapi and csape

[madhan ravi]

What code do I used to plot and produce cubic spline ?

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=2ahUKEwju0ebD2YLeAhWLM48KHQZoD10QFjADegQIBxAB&url=https%3A%2F%2Fwww.mathworks.com%2Fmatlabcentral%2Ffileexchange%2F13812-splinefit&usg=AOvVaw3BStOUChfXJvLx4z9auQJh

Answer 2

[Anon]

I dont have curve fitting toolbox so csacpi won't work.

if x = [Oct_17(1:30,2)]; y = [1:30];

What code do I used to plot and produce cubic spline ?

Answer 3

[Bruno Luong]

% fake data
x = sort(rand(1,5))  
y = rand(size(x))

xmissing = linspace(0,1,1000); % put here coordinates of pts to be computed

ycomplete = interp1(x,y,xmissing,'spline');

plot(x,y,'or',xmissing,ycomplete,'-')