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: writeCTFMRI.m
    path of file: ./repos/spm12/external/ctf
    
    the code of the file until where you have to start completion: function writeCTFMRI(fileName,MRItags,MRIdata);

% Version 1.2   25 April 2007   Module writeCPersist changed, and removed from this text
%                               file.
% Version 1.1   19 April 2007 : No changes from v1.0
% Version 1.0   27 Oct. 2006

%  Write a CTF MRI in v4 format.
%  For file format and a defineition fo CPersist objects, see document 
%  "CTF MEG FIle Formats", PN900-0088

%  Input: fileName : Name of MRI file  including path and extension.

%  Outputs: MRItags : CPersist tags describing the MRI in the format of the structure array
%                     produced by readMRI.  There must be no start and stop tags.
%                     Clnical use messages are added to _PATIENT_ID, _PATIENT_NAME,
%                     _STUDY_COMMENTS, _CTFMRI_COMMENTS.
%                      I.e  name='WS1_', type=0, data=[] and
%                           name='EndOfParameters', type -1, data=[]

%           MRIdata: 256x256x256 array.  No value may exceed 2^15-1 since the data are
%                                        converted to int16.
%               MRIdata(j,k,n) = pixel(j,k) of slice n.
%                               j = coronal slice.  j=1:anterior, j=256:posterior
%                               k = axial slice.  k=1:superior, k=256:inferior
%                               n = sagittal slice. j=1:left, j=256:right

%  Calls: writeCPersist (not included in this listing)
%         update_MRI_descriptors (included in this listing)

persistent printWarning

clinical_use_message='NOT FOR CLINICAL USE';
creatorSoftware='writeCTFMRI.m';  % Added to .infods file

NpxNot256Warning=1;  % Print a warning if the no. of slices is not 256

    
function writeCTFMRI(fileName,MRItags,MRIdata);

% Version 1.2   25 April 2007   Module writeCPersist changed, and removed from this text
%                               file.
% Version 1.1   19 April 2007 : No changes from v1.0
% Version 1.0   27 Oct. 2006

%  Write a CTF MRI in v4 format.
%  For file format and a defineition fo CPersist objects, see document 
%  "CTF MEG FIle Formats", PN900-0088

%  Input: fileName : Name of MRI file  including path and extension.

%  Outputs: MRItags : CPersist tags describing the MRI in the format of the structure array
%                     produced by readMRI.  There must be no start and stop tags.
%                     Clnical use messages are added to _PATIENT_ID, _PATIENT_NAME,
%                     _STUDY_COMMENTS, _CTFMRI_COMMENTS.
%                      I.e  name='WS1_', type=0, data=[] and
%                           name='EndOfParameters', type -1, data=[]

%           MRIdata: 256x256x256 array.  No value may exceed 2^15-1 since the data are
%                                        converted to int16.
%               MRIdata(j,k,n) = pixel(j,k) of slice n.
%                               j = coronal slice.  j=1:anterior, j=256:posterior
%                               k = axial slice.  k=1:superior, k=256:inferior
%                               n = sagittal slice. j=1:left, j=256:right

%  Calls: writeCPersist (not included in this listing)
%         update_MRI_descriptors (included in this listing)

persistent printWarning

clinical_use_message='NOT FOR CLINICAL USE';
creatorSoftware='writeCTFMRI.m';  % Added to .infods file

NpxNot256Warning=1;  % Print a warning if the no. of slices is not 256

if nargin==0 & nargout==0
  fprintf(['writeCTFMRI:  Version 1.2   25 April 2007   Creates MRIs in CTFMRI v4 format.\n',...
      '\twriteCTFMRI(MRIfilename,MRItags,MRIdata);\n',...
      '\t\tMRIfilename = complete name including path and extension .mri\n',...
      '\t\tMRItags= structure array listing descriptors in the format produced',...
      'by function readMRI.\n',...
      '\t\tMRIdata = MRI data array.\n\n',...
      '\tSee document "CTF MEG FIle Formats", PN900-0088\n']);
  return
end