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: get_HRFparams.m
    path of file: ./repos/VBA-toolbox/modules/DCM
    
    the code of the file until where you have to start completion: function [theta,phi] = get_HRFparams(TR,microDT,lin,verbose)

% get Ballon model parameters from canonical SPM HRF

% function [theta,phi] = get_HRFparams(TR,microDT,lin,verbose)
% IN:
%   - TR: the data sampling (in sec)
%   - microDT: the micro-time resolution (in sec)
%   - lin: a flag for the linearized version of the Balloon model {0}
%   - verbose: a flag for displaying (1) or not ({0}) the inversion results
% OUT:

    
function [theta,phi] = get_HRFparams(TR,microDT,lin,verbose)

% get Ballon model parameters from canonical SPM HRF

% function [theta,phi] = get_HRFparams(TR,microDT,lin,verbose)
% IN:
%   - TR: the data sampling (in sec)
%   - microDT: the micro-time resolution (in sec)
%   - lin: a flag for the linearized version of the Balloon model {0}
%   - verbose: a flag for displaying (1) or not ({0}) the inversion results
% OUT:
%   - theta: fitted evolution parameters
%   - phi: fitted observation parameters

% try, [theta,phi] = defaultHRFparams; return; end