% Purpose
%    copy grid information including coordinates value of one
%    variable to that of another variable.
%
% Synopsis
%    mexeps('copygrid',varcode1, varcode2)
%
% Description
%    It copies grid information including coordinates value of one
%    variable, refered to by varconde1, to that of another variable, 
%    refered to by varcode2.  Note:  The second variable, varcode2,
%    is not defined in epic.key file, it must be defined (with 
%    'setvar' operation) before using 'copygrid'.
%
% Examples
%    Open a data file for editing: copy axis of an old variable to 
%    that of the new one.
%
%      filename = mexeps('opene','edit_eps.cdf')
%      varlist = mexeps('varlist');
%      varcode1 = varlist(1);
%      varcode2 = 320;   	% new variable code
% 
%      % copy the axis value of variable(1) to new variable
%      % since the new variable will use the same axis.
%      mexeps('copygrid',varcode1, varcode2);
%      ...
%
% See Also
%    setvar
%