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/bspm/thirdparty/spm12
    
    the code of the file until where you have to start completion: function [pE,pC] = spm_hdm_priors(m,h)
% returns priors for a hemodynamic dynamic causal model
% FORMAT [pE,pC] = spm_hdm_priors(m,[h])

    
function [pE,pC] = spm_hdm_priors(m,h)
% returns 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) - ....
%
%___________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Karl Friston
% $Id: spm_hdm_priors.m 4579 2011-12-02 20:21:07Z karl $



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