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: fqf.m
    path of file: ./repos/mcmcstat
    
    the code of the file until where you have to start completion: function x=fqf(p,df1,df2)
%FQF     F quantile function
% x=FQF(p,df1,df2), p probability, df1, df2 degrees of freedoms 

% Marko Laine <marko.laine@fmi.fi>
% $Revision: 1.6 $  $Date: 2012/09/27 11:47:36 $

if exist('distribs') == 3 % we have the mex code

    
function x=fqf(p,df1,df2)
%FQF     F quantile function
% x=FQF(p,df1,df2), p probability, df1, df2 degrees of freedoms 

% Marko Laine <marko.laine@fmi.fi>
% $Revision: 1.6 $  $Date: 2012/09/27 11:47:36 $

if exist('distribs') == 3 % we have the mex code
  x=distribs('fqf',p,df1,df2);
else
  % non-mex version
  x = (df2./invbetainc(1-p,df2./2,df1./2) - df2)./df1;
end