Merge pull request #2810 from lukeje/fix_matlab-write-string-filename

Allow filename in write_mrtrix.m to be string or char array

matlab/write_mrtrix.m

@@ -131,22 +131,23 @@ function write_mrtrix (image, filename)
 
 fprintf (fid, '\nfile: ');
 
-if strcmp(filename(end-3:end), '.mif')
+[filepath,basename,ext] = fileparts(filename);
+if strcmp(ext, '.mif')
   dataoffset = ftell (fid) + 18;
   dataoffset = dataoffset + mod((4 - mod(dataoffset, 4)), 4);
   s = sprintf ('. %d\nEND\n              ', dataoffset);
   s = s(1:(dataoffset-ftell(fid)));
   fprintf (fid, s);
   fclose (fid);
   fid = fopen (filename, 'a+', byteorder);
-elseif strcmp(filename(end-3:end), '.mih')
-  datafile = [ filename(1:end-4) '.dat' ];
+elseif strcmp(ext, '.mih')
+  datafile = fullfile(filepath, strcat(basename,'.dat'));
   fprintf (fid, '%s 0\nEND\n', datafile);
   fclose(fid);
   fid = fopen (datafile, 'w', byteorder);
 else
   fclose(fid);
-  error('unknown file suffix - aborting');
+  error('unknown file suffix "%s" - aborting', ext);
 end
 
 if isstruct(image)