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: spm_hrf.m
    path of file: ./repos/spm
    
    the code of the file until where you have to start completion: function [hrf,p] = spm_hrf(RT,P,T)
% Haemodynamic response function
% FORMAT [hrf,p] = spm_hrf(RT,p,T)
% RT   - scan repeat time
% p    - parameters of the response function (two Gamma functions)
%
%                                                           defaults
%                                                          {seconds}
%        p(1) - delay of response (relative to onset)          6
%        p(2) - delay of undershoot (relative to onset)       16
%        p(3) - dispersion of response                         1
%        p(4) - dispersion of undershoot                       1
%        p(5) - ratio of response to undershoot                6
%        p(6) - onset {seconds}                                0
%        p(7) - length of kernel {seconds}                    32
%
% T    - microtime resolution [Default: 16]

    
function [hrf,p] = spm_hrf(RT,P,T)
% Haemodynamic response function
% FORMAT [hrf,p] = spm_hrf(RT,p,T)
% RT   - scan repeat time
% p    - parameters of the response function (two Gamma functions)
%
%                                                           defaults
%                                                          {seconds}
%        p(1) - delay of response (relative to onset)          6
%        p(2) - delay of undershoot (relative to onset)       16
%        p(3) - dispersion of response                         1
%        p(4) - dispersion of undershoot                       1
%        p(5) - ratio of response to undershoot                6
%        p(6) - onset {seconds}                                0
%        p(7) - length of kernel {seconds}                    32
%
% T    - microtime resolution [Default: 16]
%
% hrf  - haemodynamic response function
% p    - parameters of the response function
%__________________________________________________________________________
%
% The parameters p(1:4) correspond to the shape and scale parameters of two
% probability density functions of the Gamma distribution (see spm_Gpdf.m),
% one corresponding to the main response and the other one to the
% undershoot.
% Note that the mean of the Gamma distribution is shape*scale and its mode
% is (shape-1)*scale.  This means that with the default values of the
% parameters the peak of the heamodynamic response function will be around
% 5 seconds.
%__________________________________________________________________________

% Karl Friston
% Copyright (C) 1996-2022 Wellcome Centre for Human Neuroimaging


%-Parameters of the response function
%--------------------------------------------------------------------------
try
    p = spm_get_defaults('stats.fmri.hrf');
catch
    p = [6 16 1 1 6 0 32];
end