Problem with the interp function

"Error using interp (line 68)

Length of data sequence must be at least 9.

You either need more data or a shorter filter (L)."

How might I be able to fix this?

[Walter Roberson]

Is it the case that for any input vector [a b c] with factor 3, that the output would be [a, 2/3*a+1/3*b, 1/3*a+2/3*b, b, 2/3*b+1/3*c, 1/3*b+2/3*c, c]

Answer 1

[Walter Roberson]

out_vector = [reshape((reshape(diff(time_vector), [], 1) * (0:factor-1)/factor + reshape(time_vector(1:end-1),[],1)).',1,[]), time_vector(end)];