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: minirhos0.m
    path of file: ./repos/acycle/code/seriesanalysis
    
    the code of the file until where you have to start completion: function [rho, s0] = minirhos0(s0,fn,ft,pxxsmooth,linlog,genplot)
% 
% best fit of rho and s0
%
% s0: mean value of power spectrum
% fn: nyquist frequency
% ft: true frequency (a vector from 0 to nyquist frequency)
% pxxsmooth: median-smoothed poser spectrum

    
function [rho, s0] = minirhos0(s0,fn,ft,pxxsmooth,linlog,genplot)
% 
% best fit of rho and s0
%
% s0: mean value of power spectrum
% fn: nyquist frequency
% ft: true frequency (a vector from 0 to nyquist frequency)
% pxxsmooth: median-smoothed poser spectrum
% linlog: fit to S(f) or logS(f). 1 = linear; 2 = log (default)
% plot: show 3d best fit plot? 1 = yes; else = no (default)
%
if nargin < 6
    genplot = 0;
    if nargin < 5
        linlog = 2;
        if nargin < 4
            error('Error. Too few input arguments.')
        end