You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: period.m
    path of file: ./repos/acycle/code/package/swa
    
    the code of the file until where you have to start completion: %%
% Lomb-Scargle transform based on PERIOD of Press et al. (1992).
% Periodogram normalised power calculated following Press et al. (1992).
% Current frequency (FREQ) set via PNOW.
%function [x,time_ml,ndata,avex,nout,xfint,pow]=period(x,time_ml,ndata,avex)%,nout,xfint,pow(varargin
    
function [x,time_ml,ndata,avex,nout,xfint,pow]=period(x,time_ml,ndata,avex)%,nout,xfint,pow(varargin),;
function [x,time_ml,ndata,avex,nout,xfint,pow,freq]=period(x,time_ml,ndata,avex,nout,xfint,varx)%,pow(varargin),;
    
%       [x1,time_ml,ndata,avex,nout,xfint,pow,freq,varx1] 

%persistent ac freq i j nmax nmaxb twopid ; 

persistent ac i j nmax nmaxb twopid; 

%+                   freq,varx);
 if isempty(i), i=0; end