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_hdm_priors.m
    path of file: ./repos/spm
    
    the code of the file until where you have to start completion: function [pE,pC] = spm_hdm_priors(m,h)
% Return priors for a hemodynamic dynamic causal model
% FORMAT [pE,pC] = spm_hdm_priors(m,[h])
% m   - number of inputs
% h   - number of hemodynamic modes (default = 3)
%
% pE  - prior expectations
% pC  - prior covariances
%
% (5) biophysical parameters
%    P(1) - signal decay                  d(ds/dt)/ds)
%    P(2) - autoregulation                d(ds/dt)/df)
%    P(3) - transit time                  (t0)
%    P(4) - exponent for Fout(v)          (alpha)
%    P(5) - resting oxygen extraction     (E0)
%    P(6) - ratio of intra- to extra-     (epsilon)
%           vascular components of the
%           gradient echo signal   
%
% plus (m) efficacy priors
%    P(7) - ....
%
%___________________________________________________________________________

% Karl Friston

    
function [pE,pC] = spm_hdm_priors(m,h)
% Return priors for a hemodynamic dynamic causal model
% FORMAT [pE,pC] = spm_hdm_priors(m,[h])
% m   - number of inputs
% h   - number of hemodynamic modes (default = 3)
%
% pE  - prior expectations
% pC  - prior covariances
%
% (5) biophysical parameters
%    P(1) - signal decay                  d(ds/dt)/ds)
%    P(2) - autoregulation                d(ds/dt)/df)
%    P(3) - transit time                  (t0)
%    P(4) - exponent for Fout(v)          (alpha)
%    P(5) - resting oxygen extraction     (E0)
%    P(6) - ratio of intra- to extra-     (epsilon)
%           vascular components of the
%           gradient echo signal   
%
% plus (m) efficacy priors
%    P(7) - ....
%
%___________________________________________________________________________

% Karl Friston
% Copyright (C) 2008-2022 Wellcome Centre for Human Neuroimaging


% default: 3 hemodynamic [eigen]modes
%---------------------------------------------------------------------------
if nargin < 2
    h = 3;
end