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: GRID_SmoothPositive_Vtrans1_rx1.m
    path of file: ./repos/tracacode/1911-COAWST/script/mfiles/LP_Bathymetry/Mfiles
    
    the code of the file until where you have to start completion: function RetBathy=GRID_SmoothPositive_Vtrans1_rx1(...
    MSK, Hobs, rx1max, Scoord, Ccoord, hc)
% This program optimizes the bathymetry for the rx0 factor by increasing it.
% GRID_SmoothPositive_rx1(MSK, Hobs, rx1max, Scoord, Ccoord, hc)
%
% ---MSK(eta_rho,xi_rho) is the mask of the grid
%      1 for sea
%      0 for land
% ---Hobs(eta_rho,xi_rho) is the raw depth of the grid
% ---rx1max is the target rx1 roughness factor
% ---Scoord, Ccoord and hc is the vertical parameterization.

Ksea=find(MSK == 0);

    
function RetBathy=GRID_SmoothPositive_Vtrans1_rx1(...
    MSK, Hobs, rx1max, Scoord, Ccoord, hc)
% This program optimizes the bathymetry for the rx0 factor by increasing it.
% GRID_SmoothPositive_rx1(MSK, Hobs, rx1max, Scoord, Ccoord, hc)
%
% ---MSK(eta_rho,xi_rho) is the mask of the grid
%      1 for sea
%      0 for land
% ---Hobs(eta_rho,xi_rho) is the raw depth of the grid
% ---rx1max is the target rx1 roughness factor
% ---Scoord, Ccoord and hc is the vertical parameterization.

Ksea=find(MSK == 0);
HobsSel=Hobs(Ksea);
mindep=min(HobsSel(:));
disp(['mindep=' num2str(mindep) '  hc=' num2str(hc)]);
if (hc > mindep)
  disp('The minimal depth is smaller than hc');
  disp('That is a problem');
  error('Please correct');
end