freesurfer_write_wfile

 freesurfer_write_wfile - FreeSurfer I/O function to write an overlay (*.w) file

 [w] = freesurfer_write_wfile(fname, w)
 writes a vector into a binary 'w' file
  fname - name of file to write to
  w     - vector of values to be written, 
          assumed sorted from vertex 1:N

 See also freesurfer_read_wfile, freesurfer_write_surf, freesurfer_write_curv

0001 function freesurfer_write_wfile(fname, w)
0002 
0003 % freesurfer_write_wfile - FreeSurfer I/O function to write an overlay (*.w) file
0004 %
0005 % [w] = freesurfer_write_wfile(fname, w)
0006 % writes a vector into a binary 'w' file
0007 %  fname - name of file to write to
0008 %  w     - vector of values to be written,
0009 %          assumed sorted from vertex 1:N
0010 %
0011 % See also freesurfer_read_wfile, freesurfer_write_surf, freesurfer_write_curv
0012 
0013 if(nargin ~= 2)
0014     msg = sprintf('USAGE: [w] = freesurfer_write_wfile(fname, w)\n');
0015     error(msg);
0016 end
0017 
0018 % open it as a big-endian file
0019 fid = fopen(fname, 'wb', 'b') ;
0020 
0021 vnum = length(w) ;
0022 
0023 fwrite(fid, 0, 'int16') ; % latency integer
0024 freesurfer_fwrite3(fid, vnum) ;   % number of vertices
0025 for i=1:vnum,
0026   freesurfer_fwrite3(fid, i-1) ;  % FS vertices start at zero
0027   fwrite(fid, w(i), 'float') ;
0028 end
0029 
0030 fclose(fid) ;
0031 
0032 return