Spline interpolation is giving me errors with array index

Here is my code:

t = linspace(0,2*pi,8)';

f = sin(t).^2 ;

xx = linspace(0,2*pi);

yy = spline(t,f,xx);

and

Here is the error it is giving me:

Index in position 1 is invalid. Array

indices must be positive integers or

logical values.

Error in (line 4)

yy = spline(t,f,xx);

Answer 1

[Akira Agata]

At least the latest version R2019a, your code works well.

Anyway, I would recommend adjusting vector direction of t and xx, like:

t = linspace(0,2*pi,8)'; % Column vector
f = sin(t).^2 ;
xx = linspace(0,2*pi)';  % Column vector
yy = spline(t,f,xx);