what is fnn (not FNN)

I'm trying to use function [LaypExpnt]=lyaprosen(y,dt)8 var from the https://ideas.repec.org/c/boc/bocode/t741502.html

it has function fnn that causes: fnn Unrecognized function or variable 'fnn

I cannot find ANY reference to fnn in Matlab HELP, but it seems to be legitimate (not a typo...)

can anyhone help me understand this?

THANK YOU

[Shuba Nandini]

Could you please provide the code in which you are using "lyaprosen" function, so that we can investigate the case further?

Answer 1

[Walter Roberson]

The code for function fnn starts from line 228 of the file you indicated.

The code appears to work when I test in R2023b -- provided, that is, that the signal is more than 250 entries (larger if the provided dt is small enough.)