% Purpose
%    writes time axis value to data file.
%
% Synopsis
%    mexeps('puttaxis',varcode,name,frmt,units,type,ax_val)
%    mexeps('puttaxis',varcode,name,frmt,units,type,ax_val,range)
%
% Description
%    It sets and writes out time axis value to data file. The variable
%    which the axis associated with is refered to by variable code, 
%    varcode.  Input argument also include axis name, format, units, 
%    type ('even' or 'uneven') and axis value (ax_val).  The last 
%    argument, range, is optional. When it is not specified, all axis 
%    value will be written out; when it is specified, it is a 1x2 array 
%    contains [lower upper] limits of the axis value you want to write.  
%
%    The format of input time axis value must be in the form of 
%    YYMMDDhhmmss.fff.  For example, May 10, 1994 10:30:00 should be
%    940510103000.000.  The output time axis to the netCDF file is 
%    determined by the units you specified.  There two kinds output format
%    you can choose.   (1) EPS 2-integer time format, i.e. the first number
%    is "True Julian Day" and the second number is "msec since 0.00 GMT.
%    To write this time format, you must specify input units = ' '. 
%    (2) NetCDF Unidata udunits library syupported time representation,
%    e.g. attribute units = 'hour since 1994-05-30 00:00:00'. To write 
%    this time format, you must specify input units to be the same units
%    attribute ('units since YYYY-MM-DD hh:mm:ss.fff).  For example: 
%    units = 'hour since 1995-05-30 00:00:00'.
%
% Examples
%    Open a data file and write out time axis values.
%
%      mexeps('openw','pointer.file');       % open pointer file
%      mexeps('setnextw','datafile.ctd');    % open data file
%
%      ....		% write spacial axis values
% 
%      varcode = 20;
%      time = [910101000000.000; 910101010000.000; 910101020000.000];
%      % write time in EPS 2-integer time format
%
%      mexeps('puttaxis',varcode,'time',' ',' ','even',time);
%
%      ...		% write variable values.
%
% See Also
%    putvar, putaxis
%