   function write(self, varargin)
   % write dynaload memory structure to ASCII CSV file (Comma Separated Value)
% nc is a dynaload objet in memory load from xls file. for example:
% >> nc = us191.dynaload('test.xls');
% >> nc
% us191.dynaload
% 
% 	file:	test.xls
% 
% 	DIMENSIONS               	us191.hashtable
% 	VARIABLES                	us191.hashtable
% 	ATTRIBUTES               	us191.hashtable
% 
% >> s = nc.VARIABLES.SSTP
% 
% s = 
%              code: 'SSTP'
%         dimension: {'DAYD'}
%            nctype: 'float'
%         long_name: 'SEA SURFACE TEMPERATURE'
%     standard_name: 'surface temperature'
%             units: 'degrees Celsius'
%       conventions: ''
%         valid_min: -1.5000
%         valid_max: 38
%            format: '%6.3lf'
%        FillValue_: 99999
%         epic_code: []
%              axis: ''
%        resolution: 1.0000e-003
%           comment: [1x99 char]
%     missing_value: [] 
%
% write(nc, 'foo.csv');
%
% >> type foo.csv
%
% datagui_profile_netcdf.csv:  0 members & 0 lines with data; VERSION = 0.000
%
% $DIMENSIONS$
% #;code;value;#
% #;char;integer;#
% #;PROFILE;120;#
% ...
% %
% $VARIABLES$
% #;code;dimension;nctype;long_name;standard_name;units;conventions;valid_min;valid_max;format;FillValue_;epic_code;axis;resolution;comment;missing_value;#
% #;char;cell;char;char;char;char;char;double;double;char;double;double;char;double;char;double;#
% #;REFERENCE_DATE_TIME;'STRING14';char;REFERENCE DATE TIME FOR JULIAN DAYS;reference date time;;yyyymmddhhmmss;;;;;;;;Reference date for julian days origin;;#
% ...
%
% $Id$

% slip filename into path, name & extension
% -----------------------------------------
[path, name, ext] = fileparts(self.file);

% if a second arg is a file name
% -----------------------------
if isa(varargin{1}, 'char')
  path_ = fileparts(varargin{1});
  if isempty(path_)   
    self.file = fullfile(path,varargin{1});
  else
    self.file = varargin{1};
  end
elseif strcmpi(ext, '.xls')

  % otherwise change xls extension to csv
  % -------------------------------------
  [path, file, ext] = fileparts(regexprep(self.file, '.xls', '.csv'));
  self.file = strcat(path, file, ext);
end

  % open csv file 
  % ---------------
  self.fid = fopen(self.file, 'wt');
  if self.fid == -1
    error(['Can''t open file: ' self.file ' in write mode'])
  end

% display information on command window
% -------------------------------------
fprintf('Write data file:   %s\n', self.file);

% write comment information
% -------------------------
fprintf( self.fid, '%% %s:  %d members & %d lines with data; VERSION = %5.3f\n',...
   self.file, 0, 0, 0) ;
fprintf( self.fid, '%% $Id$\n%%\n');

% write  information
% ------------------------
for k = keys(self)
  fprintf( self.fid, '%%\n$%s$\n', char(k));
  
  % write header
  lk = keys(get(self, k));
  s = get(get(self, k), lk{1});
  
  % initialise str
  % --------------
  str = '#;'; str2 = '#;';
  
  for m = fieldnames(s)'
    str = strcat(str, sprintf('%s;', char(m)));
    value = s.(char(m));
      if isa(value,'logical')
         str2 = strcat(str2, 'logical;');
      elseif isa(value,'char')
         str2 = strcat(str2, 'char;');
      elseif isa(value,'integer')
         str2 = strcat(str2, 'integer;');
      elseif isa(value,'single')
        str2 = strcat(str2, 'float;');
      elseif isa(value,'double')
        str2 = strcat(str2, 'double;');
      elseif iscell(value)
        str2 = strcat(str2, 'cell;');
      else
        error('dynaload.write: undefine %s value for member %s', ....
          char(value), m);
      end
  end
  str = strcat(str, '#'); str2 = strcat(str2, '#');
  fprintf( self.fid, '%s\n', str);  fprintf( self.fid, '%s\n', str2);
  
  % write data lines
  for nk = keys(get(self, k))
    s = get(get(self, k), nk);
    str = '#;';
    for m = fieldnames(s)'
      value = s.(char(m));
      if islogical(value)
        format = '%d';
      elseif iscell(value)
        format = '%s';
      elseif isa(value,'char')
        format = '%s';
        %    else isa(value,'uint8')
        %      format = '%u';
      elseif isa(value,'integer')
        format = '%d';
      % format %g is used for scientific format 1e36 and %8.8g to write 99999.999  
      elseif isa(value,'single')
        format = '%8.8g';
      elseif isa(value,'double')
        format = '%8.8g';
      else
        error('dynaload.write: undefine %s value for member %s', ....
          char(value), m);
      end
      if isempty(value)
        str = strcat(str, ';');
      else
        if iscell(value)
          % if iscell, write 'val', or 'val1','val2', etc....
          for c = value
            % if it is last cell, add ; separator
            if strcmp(c, value{size(value,2)})
              str = strcat(str, sprintf('''%s'';', char(c)));
            else
              % add comma separator
            str = strcat(str, sprintf('''%s'',', char(c)));
            end
          end
        else
          % use strtrim to remove blank (format %8.8g)
          % ------------------------------------------
          str = strcat(str, strtrim(sprintf(strcat(format, ';'), value)));
        end
      end
    end
    str = strcat(str, '#');
    fprintf( self.fid, '%s\n', str);
  end
end

% close file
% ----------
fclose(self.fid);

end
 