You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: c_std.m
    path of file: ./repos/tracacode/1911-COAWST/script/mfiles/rutgers/4dvar
    
    the code of the file until where you have to start completion: function [status]=c_std(S)

%
% C_STD:  Creates ROMS error covariance initial condition or model error
%         standard deviation NetCDF file
%
% [status]=c_std(S)
%
% This function creates ROMS 4DVar initial conditions or model error
% (weak constraint) standard deviation NetCDF file using specified
% parameters in structure array, S.
%
% On Input:
%
%    S           Standard deviation creation parameters (structure array):
%
%                  S.ncname           NetCDF file name
%                  S.spherical        Spherical grid switch
%                  S.Vtransform       Vertical transformation equation
%                  S.Lm               Number of interior RHO-points in X
%                  S.Mm               Number of interior RHO-points in Y
%                  S.N                Number of vertical levels
%                  S.curvilinear      Curvilinear grid switch
%                  S.masking          Land/sea masking switch
%                  S.do_zeta          Switch to define free-surface
%                  S.do_ubar          Switch to define 2D U-velocity
%                  S.do_vbar          Switch to define 2D V-velocity
%                  S.do_u             Switch to define 3D U-velocity
%                  S.do_v             Switch to define 3D V-velocity
%                  S.do_temp          Switch to define temperature
%                  S.do_salt          Switch to define salinity
%
% On Output:
%
%    status      Error flag.
%

% svn $Id: c_std.m 938 2019-01-28 06:35:10Z arango $
%=========================================================================%
%  Copyright (c) 2002-2019 The ROMS/TOMS Group                            %
%    Licensed under a MIT/X style license                                 %
%    See License_ROMS.txt                           Hernan G. Arango      %
%=========================================================================%

%--------------------------------------------------------------------------
%  Get error covariance standard deviation creation parameters.

    
function [status]=c_std(S)

%
% C_STD:  Creates ROMS error covariance initial condition or model error
%         standard deviation NetCDF file
%
% [status]=c_std(S)
%
% This function creates ROMS 4DVar initial conditions or model error
% (weak constraint) standard deviation NetCDF file using specified
% parameters in structure array, S.
%
% On Input:
%
%    S           Standard deviation creation parameters (structure array):
%
%                  S.ncname           NetCDF file name
%                  S.spherical        Spherical grid switch
%                  S.Vtransform       Vertical transformation equation
%                  S.Lm               Number of interior RHO-points in X
%                  S.Mm               Number of interior RHO-points in Y
%                  S.N                Number of vertical levels
%                  S.curvilinear      Curvilinear grid switch
%                  S.masking          Land/sea masking switch
%                  S.do_zeta          Switch to define free-surface
%                  S.do_ubar          Switch to define 2D U-velocity
%                  S.do_vbar          Switch to define 2D V-velocity
%                  S.do_u             Switch to define 3D U-velocity
%                  S.do_v             Switch to define 3D V-velocity
%                  S.do_temp          Switch to define temperature
%                  S.do_salt          Switch to define salinity
%
% On Output:
%
%    status      Error flag.
%

% svn $Id: c_std.m 938 2019-01-28 06:35:10Z arango $
%=========================================================================%
%  Copyright (c) 2002-2019 The ROMS/TOMS Group                            %
%    Licensed under a MIT/X style license                                 %
%    See License_ROMS.txt                           Hernan G. Arango      %
%=========================================================================%

%--------------------------------------------------------------------------
%  Get error covariance standard deviation creation parameters.
%--------------------------------------------------------------------------

if (isfield(S,'ncname')),
  ncname=S.ncname;
else
  error(['C_STD - Cannot find dimension parameter: ncname, ',           ...
         'in structure array S']);
end