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: vsh_modified_in_fast.m
    path of file: ./repos/spm/toolbox/TSSS/private
    
    the code of the file until where you have to start completion: % Vm = vsh_modified_in_fast(theta,phi,l,m,p0)
%
% Vector spherical harmonic funtion modified from Hill's function
% V_lm for quantum numbers l and m. Angles theta and phi should be
% given in radians. p0 contains the values of the Legendre polynomial.
%
function Vm = vsh_modified_in_fast(theta,phi,l,m,p0)

% Copyright (c) 2016, Elekta Oy
% ---------------------------------------
% 
% Redistribution and use of the Software in source and binary forms, with or without 
% modification, are permitted for non-commercial use.
% 
% The Software is provided "as is" without warranties of any kind, either express or
% implied including, without limitation, warranties that the Software is free of defects,
% merchantable, fit for a particular purpose. Developer/user agrees to bear the entire risk 
% 
    
function
% V_lm for quantum numbers l and m. Angles theta and phi should be
% given in radians. p0 contains the values of the Legendre polynomial.
%
function Vm = vsh_modified_in_fast(theta,phi,l,m,p0)

% Copyright (c) 2016, Elekta Oy
% ---------------------------------------
% 
% Redistribution and use of the Software in source and binary forms, with or without 
% modification, are permitted for non-commercial use.
% 
% The Software is provided "as is" without warranties of any kind, either express or
% implied including, without limitation, warranties that the Software is free of defects,
% merchantable, fit for a particular purpose. Developer/user agrees to bear the entire risk 
% in connection with its use and distribution of any and all parts of the Software under this license.
% 

scale = 1;

%scale_sph = (-1)^m*sqrt((2*l+1)*prod(1:(l-m))/(4*pi*prod(1:(l+m))));
%scale_minus = 1/((-1)^(m-1)*sqrt((2*l+1)*prod(1:(l-(m-1)))/(4*pi*prod(1:(l+(m-1))))));
%scale_plus = 1/((-1)^(m+1)*sqrt((2*l+1)*prod(1:(l-(m+1)))/(4*pi*prod(1:(l+(m+1))))));

Y = spharm_fast(theta,phi,l,m,p0);
if m > -l
  Yminus = spharm_fast(theta,phi,l,m-1,p0);
else
  Yminus = 0;
end