Why does the LEVINSON function not require the auto-correlation value R(0) in Signal Processing Toolbox 6.9 (R2008a)?

Inam-ul-Haq asked: 2021-03-12 matlab , signal , signal processing

Understand why MATLABs Levinson function in Signal Processing Toolbox 6.9 (R2008a) doesnt require the autocorrelation value r(0). Explore the functions inner

Expert Answer

Neeta Dsouza answered . 2025-07-30 11:01:30

This change has been incorporated into the documentation in Release 2009b (R2009b). For previous releases, read below for any additional information:

The documentation is using MATLAB-style indexing for the input auto-correlation vector "r", as "r(1)" actually refers to the first element of the auto-correlation vector "r", which is the zeroth lag correlation value.

This is further confirmed by typing

help levinson

 at the MATLAB prompt, as the following text is displayed:

 Input R is typically a vector of auto-correlation coefficients with lag 0 as the first element.

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